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Comment by Sipder2

The mobs that count towards this achievement have debuff "Seething Corruption".
To generate the corrupted creatures you must kill their normal versions, following is a list of all creatures and their equivalents:

Normal mob > Corrupted Version

Found during Uldum Black Empire Assault:

Acolyte of N'Zoth > Corrupted Acolyte
/way 49,53, 39,86
/way 51,23, 73,20
/way 49,71, 73,68
/way 49,04, 80,02
/way 46,26, 79,74
/way 47,75, 84,50
/way 49,10, 83,81
/way 57,12, 42,46
/way 55,80, 41,50
/way 54,87, 42,07
/way 53,79, 43,11
Video guide https://youtu.be/NQS7JTrmT60

Black Empire Beheader > Corrupted Beheader
/way 58,39, 42,80
/way 52,58, 46,42
/way 60,04, 49,52
/way 51,01, 71,22
/way 50,05, 78,69
/way 50,24, 73,13
/way 50,53, 85,76
/way 49,11, 84,67
Video guide https://youtu.be/Uh74dpklHck

N'Zoth Bonestripper > Corrupted Bonestripper (found in virtually all water locations on the map)
/way 55,71, 43,81 to /way 59,58, 60,84
/way 57,47, 17,70
/way 56,56, 20,55
/way 56,52, 24,43
/way 57,33, 27,41
Video guide https://youtu.be/vYOcDYiaEu0

Faceless Dominator > Corrupted Dominator
/way 62,95, 71,00
/way 63,81, 72,79
/way 64,45, 74,54
/way 60,16, 66,39
/way 61,63, 69,39
/way 56,53, 42,07
/way 53,70, 43,88
Video guide https://youtu.be/cUg-AQufHBs

Burbling Fleshbeast > Corrupted Fleshbeast
/way 59,50, 48,59
/way 48,96, 35,55
/way 62,19, 68,71
/way 60,88, 69,34
/way 60,39, 67,48
/way 61,98, 66,74
Video guide https://youtu.be/lPSyjntHKtA

Mind Eater > Corrupted Mind Eater (SHARE RESPAWN WITH Faceless Despoiler > Corrupted Despoiler)
/way 59,53, 47,38
/way 59,11, 42,74
/way 55,12, 53,39
/way 49,43, 39,63
/way 60,17, 53,61
/way 58,36, 24,84
/way 55,61, 24,39
Video guide https://youtu.be/rg_S_xY-fvY

Foul Observer > Corrupted Observer
around /way 55,45, 51,08
Video guide https://youtu.be/59u2TDYCyWs

Black Empire Summoner > Corrupted Summoner
/way 58,86, 46,15
/way 60,28, 50,94
/way 59,68, 50,88
/way 57,16, 56,38
/way 57,99, 59,71
/way 58,32, 60,88
/way 56,45, 54,88
/way 60,39, 49,51
/way 56,55, 51,37
/way 56,21, 52,70
/way 56,08, 50,10
/way 54,11, 49,47
/way 53,43, 49,35
/way 51,94, 50,14
Video guide https://youtu.be/qmXL_TBh-RU

K'thir Thoughtstealer > Corrupted Thoughtstealer
/way 62,66, 75,36
/way 60,97, 71,99
/way 60,51, 68,68
/way 60,51, 65,51
/way 61,06, 66,49
/way 62,93, 74,33
Video guide https://youtu.be/yHe2aaLdu2s

Faceless Despoiler > Corrupted Despoiler (SHARE RESPAWN WITH Mind Eater > Corrupted Mind Eater)
/way 59,53, 47,38
/way 59,11, 42,74
/way 55,12, 53,39
/way 49,43, 39,63
/way 60,17, 53,61
/way 58,36, 24,84
/way 55,61, 24,39
/way 57,65, 54,33
/way 58,87, 58,03 to /way 56,69, 52,23
/way 54,20, 42,26
Video guide https://youtu.be/-2XAHeuPBbA

Black Empire Assassin > Corrupted Assassin
/way 51,71, 71,13
/way 50,67, 72,33
/way 50,21, 72,59
/way 50,38, 73,65
/way 50,03, 78,70 (stealth)
/way 51,23, 80,03
/way 49,36, 80,89
/way 48,58, 85,63
/way 50,05, 71,78
/way 52,18, 84,48 (stealth)
/way 50,72, 69,41 (stealth)
/way 51,95, 69,39 (stealth)
/way 50,02, 71,71 (stealth)
Video guide https://youtu.be/lMPGc2eBYA4

Voidwarped Watcher > Corrupted Watcher
/way 61,81, 73,03
/way 63,43, 72,86
/way 52,00, 69,76
/way 50,47, 82,45
/way 52,22, 81,60
/way 52,11, 82,96
/way 50,84, 69,83
Video guide https://youtu.be/OO2XTTLldtM

K'thir Doomsayer > Corrupted Doomsayer
/way 60,82, 71,46
/way 60,24, 71,33
/way 61,95, 73,71
/way 49,83, 39,87
/way 49,58, 41,38
/way 61,78, 70,63 (wquest Voidflame Ritual)
/way 61,37, 75,19
/way 63,52, 69,95
Video guide https://youtu.be/0iBlC72Dya8

Faceless Jailer > Corrupted Jailer
/way 60,82, 71,46
/way 62,05, 74,73
/way 63,36, 72,59
/way 62,23, 67,44
Video guide https://youtu.be/3Nj8PLzPk1E

Voidwarped Neferset, Voidwarped High Guard(think) > Corrupted Neferset Guard
/way 50,87, 82,87
/way 50,95, 81,76
/way 51,55, 82,96
/way 51,55, 81,72
/way 49,79, 81,97
/way 49,76, 82,59
/way 48,97, 82,60
/way 47,27, 80,25
/way 50,71, 85,46
/way 50,33, 85,50
/way 50,49, 77,87
/way 50,84, 77,81
/way 50,88, 74,97
/way 50,50, 74,96
Video guide https://youtu.be/cq7fiK_n3l4

Oozing Putrefaction > Corrupted Putrefaction
/way 59,26, 41,41
/way 60,38, 39,89
/way 47,38, 26,31
/way 57,07, 81,63
/way 60,75, 37,07
Video guide https://youtu.be/YM_h1U44txk

Black Empire Thaumaturge > Corrupted Thaumaturge
/way 51,86, 70,34 to /way 50,52, 81,83
/way 50,07, 74,62
/way 50,59, 87,47
/way 51,94, 84,36
/way 51,93, 80,56
Video guide https://youtu.be/7si5Lf8rT1M

Found during Vale of Eternal Blossoms Black Empire Assault:
Faceless Tormentor > Corrupted Tormentor
/way 67,80, 55,01
/way 64,79, 54,63
/way 59,02, 61,30
/way 54,33, 63,51
/way 41,82, 64,63
/way 69,30, 30,82
/way 69,52, 44,58
/way 73,38, 49,28
/way 78,29, 58,00
/way 81,03, 34,13
/way 61,57, 33,74
/way 53,03, 66,23
/way 49,80, 68,05
/way 78,04, 47,27
Video guide https://youtu.be/ZZatdd89kxw

Tidal Corruptor or Drowned Zealot > Corrupted Bloodseeker
I believe this mob generates from Tidal Corruptor or Drowned Zealot.
These two mobs are a kind of cult and quote a phrase that says something about blood.
As soon as the Vale of Eternal Blossoms Assault starts I put the coordinates for those who want to try.
Video guide https://youtu.be/zDB1BeBaioY

Comment by Niixten

Macro 1
/tar Corrupted Acolyte
/tar Corrupted Beheader
/tar Corrupted Bonestripper
/tar Corrupted Dominator
/tar Corrupted Fleshbeast
/tar Corrupted Mind Eater
/tar Corrupted Observer
/tar Corrupted Summoner
/tar Corrupted Thoughtstealer
/tar Corrupted Watcher

Macro 2
/tar Corrupted Assassin
/tar Corrupted Bloodseeker
/tar Corrupted Despoiler
/tar Corrupted Doomsayer
/tar Corrupted Jailer
/tar Corrupted Neferset Guard
/tar Corrupted Putrefaction
/tar Corrupted Thaumaturge
/tar Corrupted Tormentor

Comment by Turowai

NPC ID's for Silver Dragon (until they add it themselves, just c+p these numbers (just the numbers) into the 'custom' field and hit 'okay')

162249 Corrupted Acolyte
162250 Corrupted Assassin
162252 Corrupted Beheader
162290 Corrupted Bloodseeker
159087 Corrupted Bonestripper
156709 Corrupted Despoiler
162246 Corrupted Dominator
162244 Corrupted Doomsayer
158632 Corrupted Fleshbeast
162247 Corrupted Jailer
162243 Corrupted Mind Eater
158531 Corrupted Neferset Guard
162254 Corrupted Observer
158706 Corrupted Putrefaction
162251 Corrupted Summoner
162253 Corrupted Thaumaturge
162241 Corrupted Thoughtstealer
162245 Corrupted Tormentor
162248 Corrupted Watcher

These NPC's can drop Corrupted Mementos too, so it's worth killing them whenever you see them. They also don't seem to have a daily lockout... I killed the same one twice (respawning within the 20mins or so it took me to write this up) and got another 10 memento's off of it.
EDIT: Seems there is some diminishing returns on this however, so while you'll get 10 memento's per kill to begin with, you'll get 5 and then 1 if you kill lots of them. (Thanks Buenaventura). Is still worth killing them if you come across them though imho. :)

Also note, they generate a debuff that stacks (every stack forces 1 corruption on you for half hour)... seems to be roughly every 5secs? urgh...

Happy hunting! <3

Comment by Murderr

Well original author might be angry but oh well...
here is edited algan weakaura to find corrupted mobs(it scans nameplates and put mark+make sound when you near corrupted npc)
https://pastebin.com/R937cq4D
edited with new link

Comment by Niixten

I have spent over 20 hours trying to find the last two for the Combating the Corruption with no luck.
~~I’m certain that Corrupted Tormentor and Corrupted Bloodseeker are bugged or never were implemented to live servers.~~

I have sent a few bug reports so let’s hope they can fix this soon.

Edit: Seems like people have found the last two (Great job finding them!), both of them can be at any place at the shoreline south of Uldum during black empire assault.

Comment by Faell

Just finished this. It took many hours of killing place-holders to spawn the corrupted versions. Don't expect to knock this out quickly. A few notes:

The Courrpted Summoner is spawned from Black Empire Conjurers, not Black Empire Summoners. This is clearly an oversight or bug as all other mobs use the same name.

The Corrupted Neferset Guard is spawned from Voidwarped Neferset, not Voidwarped High Guards.

The Corrupted Tormentor is spawned from Tentacle Tormentors, not Faceless Tormentors.

The Corrupted Bloodseeker does not appear to work like the other mobs in this achievement. I cannot say for certain, but it appears to me that it may be a rare spawn that always spawns corrupted. You do not kill place-holders to spawn it.

Comment by Rexoraptor

Seems like the same version can be up more than once at the same time. have been flying around and found 3 corrupted fleshbeasts within 7 mins.

Comment by ToriaURU

I have confirmation via screen shot on demand and visual confirmation that the Corrupted Summoner is spawned by killing the Black Empire Conjurers. I personally killed a Corrupted Summoner after farming the Conjurers for quite a while at 53, 49 which exactly correlates to one of the positions of the Black Empire Conjurer. Screenshot showing positioning of target submitted for approval.

Comment by Elodeon

Trying to get the Corrupted Watcher is absolutely brutal. I know of 7 spawn points for Voidwarped Watchers in Neferset and Lost City. You can cover them with 2-3 people. If geared, even one person can cover them reasonably well enough to kill them as they spawn.

But after killing them for several hours, be prepared to have nothing to show for it except 100+ gray items in your bags. We killed well over 120 over several hours in one session, I killed another ~40 in another session. No Corrupted Watcher.

Comment by alxndros

I don't wanna hurt any feelings, but this achievement defines perfectly what this game has become. It is insane and a non-sense being all the time doing the same: kill "N" times the mob "X" in order to get the final mob "Y". And of course everything based on RNG. It is not real progress, it's just repetition all the time. I don't want to mention the number of times I required to get a Corrupted Watcher. Madness..., just that.

And what's even better is that the achievement provides nothing, no mount or title or toy...

So, what's the point of playing this kind of content? Waste of time

Comment by Dranamor

You know, I don't ever leave comments myself, but I've been farming the final two here for like 3 weeks, and it doesn't matter how many Voidwarped Watchers or Voidwarped Neferset I kill: they just don't want to go corrupt. Now, I understand that RNG plays a big role in some things, but there's a point where RNG is just...it takes the fun out of achieving. Yes, I don't have to make the choice to do the achievement, but I would like to. I don't really want to spend countless hours killing the same mobs over and over, because there's no pattern or formula to this. It's rote kill, check and see; repeat. Anyway, there's a bit TOO much RNG-based everything in this expansion, so hopefully we'll get some achievements that are a bit more meaningful in the next xpac.

One thing to add here; if the other faction tags a corrupted mob, other faction can't kill it, unlike some Elites with WM off. Used the NPCscan ID's from previous posts and added them into the "Custom" tab; really helped having a visual cue, instead of scanning for corrupted mobs.

Comment by ennuicorn

Tip for ElvUI users:

In ElvUI settings -> nameplates -> Style Filter, create a new style filter and add the names of all the mobs that produce corrupted mobs. Then in the Actions tab, you can mess around with the health color or whatever to make all these mobs have easily identifiable nameplates! Then just remove the corresponding names from the filter as you kill their corrupted counterparts.

Comment by Ttazi92

This achievement reeks of degenerate gameplay

Comment by Dahustler

Corrupted Watcher: 30min farm
Corrupted Jailer: 90min farm
Corrupted Neferset Guard (last one I miss): committed genocide to Voidwarped Neferset for 8+ hours, no spawn, but killed another Corrupted Watcher that randomly spawned.

PS: Tormentor and Bloodseeker I found along the Coast during the "middle" Uldum invasion and all others I found randomly while questing.
PPS: Found the Corrupted Neferset Guard 1 hour after posting this. Don't give up!

Comment by Marhault

I was able to spawn a Corrupted Bloodseeker while trying to spawn a Corrupted Tormentor from killing the Tentacle Tormentor's off the southern coast in Uldum. It appears as a corrupted shark. Luckily I was able to spawn them both back to back to finish out this achievement!

Comment by Melandroso

Corrupted Summoner spawns from Black Empire Conjurer (in Uldum). I got mine at 56.6, 35.0.

Comment by Bronzebag

My tips and experience:

Use the weakaura linked by Mudererr, it's a lifesaver.
Corrupted Neferset Guard took 8 hours of killing to spawn (in Neferset spawned by Voidwarped Neferset).
Corrupted Despoiler took 3 hours of killing to spawn (Lost City of Tol'vir).
Corrupted Watcher took 2 hours of killing to spawn in Neferset (farmed with the Neferset Guards).
Corrupted Bonestripper spawned after 1 hour of farming. The best location to farm this is the start of the lake at the top near Khartut's Tomb, no people here.
Corrupted Bloodseeker and Corrupted Tormentor are very quick spawns along the south-west coastline.

The rest took less than 20 minutes to spawn or killed during questing.

Comment by Osaye

25 hours of killing Voidwarped Watcher covering all seven spawns.
No luck yet.

Comment by Elodeon

I had spent 5+ hours killing Corrupted Watchers on multiple occasions without ever seeing one. Usually, I killed them at quiet times during the middle of the night.

After seeing comments where some people got it to spawn in 30 minutes and others have had no luck for 28 hours, I figured there might be a precondition other than just killing Voidwarped Watcher that must be met. Instead of killing all 7 Watchers over and over again, I decided to first:

1. Clear the zone of any other Corrupted mobs that I could find.

2. Kill the 5 Voidwarped Watchers in Neferset. At item level 480, this takes me about 2 minutes.

3. Since the Watchers take 7 minutes to respawn, I would spend that time going around hunting any other Corrupted mobs.

I repeated this a few times and noticed that the same Corrupted Putrefaction keeps spawning in the exact same spot every 2-3 minutes. When I was finally successful, I was trying to time this Corrupted Putrefaction to be dead during the ~2 minute window when my Watchers would be respawning.

One of my 5 Watchers finally respawned as Corrupted when I did that. Once I killed it and got the achievement, the same Corrupted Putrefaction was also respawned.

I'm not sure if it was strategy or dumb luck, but it could be the system has a threshold of how many Corrupted mobs there ought to be at any time. It could be Watchers won't respawn Corrupted if there are too many other live Corrupted mobs.

Comment by weltallica

Imagine camping/killing the same mob for hours, over and over, for days, not realizing you have ZERO chance of spawning a Corrupted version because there's a Corrupted Acolyte somewhere on the other side of the zone, and there's a cap on how many Corrupted rares can spawn.

Comment by Tequima

From other posts, it seems that (a) there is a cap on the number of Corrupted that can be up at a time (b) there are some bugged Corrupted Putrefactions in the Uldum Central zone that respawn into Corrupted every time, thus preventing other Corrupted from spawning. This will impact in particular Watchers, Jailers and possibly Tormentors & Bloodseekers (both in the sea).

I created this macro to target any corrupted in a zone and set a skull icon on them.

If not found, it targets the mob that needs to be killed (e.g. Bloodseeker) and puts an X raid marker on them. You will need to edit it for the one you are currently seeking.

/tar Corrupted
/targetmarker 8
/stopmacro
/tar Bloodseeker
/targetmarker 7

Comment by Mcelhatton

Corrupted Tormentor - these squids are in the sea south of Uldum along the coastline. You will find a corrupted at the edge of Uldum-Tanaris but it is too far to aggro as you arrive from the sea. Fly along the hills and land on the hills next to the sea in reach of the target which you will find north east of the cursed landing. Use a target macro to find it : /tar Corrupted Tormentor

Comment by Notoriousbird

This achievement has to be bugged for some of the Uldum mobs. Corrupted Putrefactions in the north constantly just respawn in the same spot when killed. Even when changing to another shard such as US servers (I'm an OCE player) or to WM on, the same putrefactions always respawn in the same spot. Because there's a cap to how many corrupted mobs can spawn in the zone it makes it highly unlikely that the mob you want will spawn corrupted, specifically the big elite mobs such as Jailers and Watchers.

What a terrible, terrible achievement. Way too much RNG on top of buggy spawns. Probably won't be fixed. GJ blizz!

Comment by Currently

So, before I attempted this achievement, I read about it here and was dreading it because it sounded extremely time consuming and annoying. In all honesty, it wasn't that bad (for me.)

Using this WeakAura is ABSOLUTELY ESSENTIAL! https://pastebin.com/11bqTctE I did not create this, I am simply re-posting it. I already had a few of them done when I started this. I really just picked one or two off the list that were in the same approximate area and focused on those. The worst for me was the Corrupted Neferset Guard. I must've obliterated that entire race before finding one. I did not use any tricks or strategies to find the corrupted versions. I simply killed, and killed, and killed and kept on killing them until they eventually spawned.

Altogether, this achievement probably took me roughly 12 hours to complete over a couple of days.

Comment by zigtoria

There are some mobs which spawn only in Uldum. The rest spawn in both zones.
Uldum:

Both:

Comment by Skorfhen

I created an account just to share my xp on this. And i am taking the time because I doubt Blizzard will take time to fix anytime soon this achievement, that is rigged because of a bug that's been mentionned months ago in many posts of this page.

Also, because it is old content. This means you wont be able to randomly accomplish the achievement like people could do it on live patch (since zone was cleared and farmed to accomplish quests making the corrupted versions spawn less "controlable"), because you have to understand some requirements or you will get stuck.

1 - Corrupted versions can only spawn when you kill regular mobs, because they take the spot of a normal version of this same mob.
2 - There can only be a limited versions of corrupted mobs. Farming for hours in the zone without any people being present too (at night, wm off french server), I would be confident to say it is limited to 3 at the same time, even less.

Now there is a third aspect to take into consideration here : if the bug is present (i dont know what triggers it though), there are 2 spawns of corrupted Putrefaction that can be respawning in a 1-2 mn timeframe on the same very spot you killed it. For me it was, south west of lost city and west of field area where observers (eyes) spawn.
This means that if you don't get rid of this bug, you will have a very, very hard time to clean this achievement efficiently since they will be taking 2 out of 3 spots for corrupted spawns, thus reducing your chances by as much.

To prove my point, let me share you my own xp on this. I did the achievement in 2 big sessions of farm :

1) First one was in October just before Shadowlands, with still a bit of people farming the zone (but not too much, so I was able to guess some patterns). When farming this, things went pretty smoothly aside from Watchers, that took 2 hours of farming between all the corrupted mobs. For the rest, it took me around 3 hours to get all corrupted versions off the list (except jailers). What was happening was people were farming the zone and thus, probably killing bugged corrupted versions / unvoluntarily removing the bug by accomplishing the weekly quest. What i noticed during this time was there seemed to be a kind of flow with the spawn of corrupted versions : it seemed more likely that a new corrupted type would spawn rather than a corrupted version i just killed, even if mobs of that type had died. In this farm session, I killed had all corrupted versions spawn, except Jailers. And since SL went live, i just dropped the ach here.

2) Tonight, I decided to get over with this achievement. I had tried not too seriously to kill a few jailers here and there a few weeks ago, without insisting and thus nothing spawned.
Tonight, without reading the comments here, i noticed the same bug that has been described here (which i didnt encounter during the first session) : 2 corrupted putrefactions permanently respawning just 1 minute after i killed them. I tried like another poster here to clear the putrefactions just before the jailers would respawn (5mns) to have a corrupted jailer triggered. I farmed like this over and over, yet nothing worked for 2 hours.
And then I thought : "how can i beat this bug ? I never encountered this last time, so maybe there is a usual mechanic people would naturally do during live patch that i'm not doing. Since i'm only here for the achievement, I am actually just killing the corrupted version, and nothing else". And there it was : i was spam killing the corrupted putrefactions without clicking the tumor just next to it. To test if my theory proved right, I did just one try at once and killed one corrupted putrefaction and clicked the tumor next to it.
Waited for 10 minutes, and the corrupted putrefaction did not spawn anymore. At its place, just a regular version spawned.
To test this further and eliminate randomness, I went to the second spot and did the same : killed corrupted version, clicked the tumor next to it. No spawn in a ten minute frame either.
I did another full tour of the zone to check that no other corrupted putrefaction bugs had spawned in the zone. And it wasn't the case. No other corrupted mobs were present either.
I went back to my corrupted jailer farm. After the second tour (killed 8 jailers), there was my corrupted jailer, granting me the achiev. Went around the zone at old corrupted putrefaction spots, and they weren't up even 1 hour after I killed the always respawning spots.

I wrote this long text to be clear and show how my hypothesis proved right and worked, for me.
Based on that I would highly recommand that you try to get rid of any corrupted putrefactions bug before you try this ach. Also, feel free to comment and confirm or refute my theory.
But so far, since the post adressed the problem but did not provide a solution, I took the initiative to share what worked for me.

Comment by Bokadi87

Hi guys, took me roughly 10 hours to get this done, the 10 hour part coes of the watcher being such a pain to spawn. Did it in group of 2, one of us with WM on and one with WM off so we would kill twice as many watchers, good luck! (make sure to sweep the area of any other corrupted mobs and fish for the ones you are missing)

Comment by Raincloud

To add it to NPCScan addon

/npcscan add 162249 Corrupted Acolyte
/npcscan add 162250 Corrupted Assassin
/npcscan add 162252 Corrupted Beheader
/npcscan add 162290 Corrupted Bloodseeker
/npcscan add 159087 Corrupted Bonestripper
/npcscan add 156709 Corrupted Despoiler
/npcscan add 162246 Corrupted Dominator
/npcscan add 162244 Corrupted Doomsayer
/npcscan add 158632 Corrupted Fleshbeast
/npcscan add 162247 Corrupted Jailer
/npcscan add 162243 Corrupted Mind Eater
/npcscan add 158531 Corrupted Neferset Guard
/npcscan add 162254 Corrupted Observer
/npcscan add 158706 Corrupted Putrefaction
/npcscan add 162251 Corrupted Summoner
/npcscan add 162253 Corrupted Thaumaturge
/npcscan add 162241 Corrupted Thoughtstealer
/npcscan add 162245 Corrupted Tormentor
/npcscan add 162248 Corrupted Watcher

Comment by Omtatsat

As Sipder's post only covers Uldum's normal versions of mobs, here are some of the Vale ones:
Tidal Corruptor - Corrupted Doomsayer
Living Infestation - Corrupted Fleshbeast
Faceless Tormentor - Corrupted Mind Eater
Eye of the Empire - Corrupted Observer
Black Empire Conjurer - Corrupted Thaumaturge (in Uldum, Black Empire Conjurers spawn Corrupted Summoner, but that's because Uldum Conjurers have a different NPC ID - Black Empire Conjurer)

Comment by JeackTL

As of 9.2.7 the Putrefaction bug is still happening. I found 3 bugged ones right next to each other in the NW part of the zone. However, I also found 3 other corrupted mobs in the zone in one lap. ~~Either the bugged putrefactions don't affect the zone cap, or the zone cap is 6+.~~

Edit: Alright new theory. I think the putrefactions DO prevent other corrupted mobs from spawning, and the cap is 3-4 in the zone at once - but the putrefactions ignore the zone cap when they themselves spawn. When I originally posted I had been killing those putrefactions to force other spawns, and I think it allowed the other 3 corrupted mobs to spawn - BUT the bugged putrefactions continued to spawn, which is why I saw 6 total corrupted mobs up at once. I have since done circles for another couple of hours without killing the putrefactions and have seen 0 or 1 other corrupted mobs up at any time.

Regardless of how to work around this bug, it is very frustrating that Blizz allows bugs like this to exist in the game for years, after tying an achievement to it.

Comment by Gaviin

Just to add a data point, today I flew around most of Uldum and tracked at least 8 and probably 10 corrupted mobs up at the same time (one of them was gone by the time I returned to its spot, so it might have been killed, which could have led to an extra spawn at some point in my surveying). They were of various types... couple Putrefactions, Dominator, few Fleshbeasts, couple Doomsayers, Observer, Despoiler.

So the theory about there being a ~3 corrupted mob zone-wide cap at any given time seems to no longer be the case.

Comment by Syliira

Some thoughts on doing this in 10.2+:
Most of the mobs on the list work exactly as described in the top post ("Regular" mob > "Corrupted" mob). The ones that don't include:
- The Corrupted Bloodseeker - this is a shark off the coast of Uldum, does NOT share spawn time with other mobs, just seems to periodically respawn. It does NOT spawn from the tidal corruptors or the drowned zealots as the OP guessed.
- The Mind Eater & Despoiler share (most) spawn points in Uldum, you'll need to kill both to get a pop. FWIW, I saw many corrupted mind eaters and only 1 despoiler. I also only saw the 1 despoiler in the areas where they share pops. There are 3 reliable despoiler pops on the big bridge to the south of the ally town, but they never spawned a corrupted version that I saw.
- The Corrupted Summoner (in Uldum) is spawned by killing the Black Empire *Conjurer*, not the Black Empire Summoner. There are a lot of comments on this, and they are correct. This *may not* be true in the Vale assault. I confirmed this personally in Uldum by killing Conjurers to spawn both Corrupted summoners & thaumaturges. I got 4 summoners, 0 thaumaturges.
- The Corrupted Thaumaturge (in Uldum) DOES spawn by killing the Black Empire Thaumaturges (Neferset City only). I'm calling this out specifically because there are comments indicating that it spawns in the Vale by killing the Conjurers. In Uldum, I can confirm that it was 100% a thaumaturge kill that spawned the corrupted version, NOT a conjurer. There are 6 of them in the city, and I switched to farming the thaumaturge after I got 4 Corrupted summoners by farming only the conjurers (including the ones in Neferset City). If you look at the video for the thaumaturge you'll see it shows one of the mobile mobs as a spawn - it is NOT a conjurer spawn (all 3 in the city are stationary). YMMV in the Vale assault.

Other relevant thoughts:
- If you are just starting this, you are better off waiting for an Uldum assault; many mobs only spawn there. I only got like 4-5 in the Vale, the rest in Uldum the following week.
- There's lots of comments about there being some kind of apparent cap on corrupted mobs. This definitely tracks with my experience, though it may be higher than originally speculated (see the other DF comment that says they saw 8-10 mobs). Some can be a pain to find (especially tormenters), so there may only be a few that are easily findable. I spent a lot of time farming and farming until I started incorporating sweeps for other corrupted mobs. Once I found 1 (and especially 2-3) I directly went to farm the mobs I was trying for at the time. This is how I got a corrupted watcher in a few hours (check the comments for the hell that people went through on that one), the thaumaturge, the summoner, and the despoiler.
- One other thought on clearing corrupted mobs you don't need - try to be aware if anyone is in the zone competing. While this is 2 expansions back (nearly 3) I almost always saw Someone in the zone doing stuff (either Corrupted mobs, daily quests for rep, or whatever) and what that means is that while they might trigger more pops, it also means that they might get the corrupted pops you are trying for. Doing sweeps for easy corrupted mobs (fleshbeasts & putrifications) without doing anything else can give you a sense if there is competition at the moment. If there is, you may wish to incorporate other goals (rare mob achieve, tumors, maws, rep) because you don't have total control. If you Don't see any evidence of other people, this is the time to find as many corrupted mobs as you can and then farm your target mobs as fast as you can - it will (hopefully) force the pops you need. I got all of my last mobs this way (watcher, summoner, thaumaturge, tormenter)
- The best way to farm the fishes (bloodseeker or tormenter) is by using Feast of the Fishes + Crispy Bacon, which turns you into a fish for 5 minutes (+60 minutes/bacon). You can then swim up and down the uldum coast. However, i would NOT try this unless you do the corrupted mob sweep in an empty zone, because you can't leave the water (you're a fish) unless you kill the food. So the best way to do it is to kill a corrupted mob (or 2) close to the coast, then turn immediately into a fish and start farming tormenters. If you don't know that corrupted spawns have been triggered, you could be in there a long time (you'll be relying on other people to kill them and cause spawns)
- If you are having trouble finding corrupted mobs in order to force spawns, try going up & down the main river (south of the city, to the lost city area). Whenever I couldn't find a corrupted mob I almost always found a bonestripper in the main part of the river that helped me get things going again. I do wonder if maybe the corrupted mob counter is non-equal for all the different types of mobs - I.e. stuff like fleshbeasts and doomsayers count for 1 "slot", while rarer mobs like watchers and bonestrippers take more, which would account for how much harder it can be for them to pop. Just a thought.

I want to thank all the previous posters for all the pain and suffering they went through to gather the information over the past years. Thanks to them, I got this done with moderate effort over about a week, which seems to be leaps & bounds faster than when it first went live. Hopefully future achievement hunters will take even less time with this summary.

Comment by KazzakMonk

This has to be the most annoying achievement ever to be created in the history in WoW. The "CORRUPTED NEFERSET GUARD" will just not spawn. I am switching between wm on and off and killing all the respective mobs for multiple days during the week. It just won't spawn. What fun is this? This is just horrible game disign. I hope whoever thought of this got fired from Microsoft...

Edit: The golden rule was once more proven - come on wowhead to complain and results will come shortly after. After going to sleep last night, i woke up this morning determined to do nothing in WoW unless I get this done as the NEFERSET GUARD was the last thing I needed. After 15-20min of genocide, there it was! Such a relief, I am free to move on. Terrible achievement design....

Comment by BlueSpider

This is an import for RareScanner
162247 1527:6060-7160,6140-6600,6140-7520
162249 1527:5180-4680,4620-7980,4740-3840
162251 1527:6020-4940,4780-8440,4980-7340
162253 1527:4720-7820,4620-8140,4640-8300
158706 1527:5660-3400,5440-3200,5440-4900
162245 1527:4580-9380,1240-7120,1300-6480
156709 1530:5400-4200,3740-4060,4020-3740
162246 1527:5360-4360,5140-4640,5240-3940
162248 1527:5080-6960,5000-7860,5040-8020
162250 1527:4920-8540,4620-8040,4640-7820
162252 1530:4420-6920,4200-6100,4200-6680
162254 1527:5420-5160,5480-4940,5520-5300
162241 1527:6240-7520,5200-4840,5320-5080
162243 1527:5500-5320,4440-2980,4600-3000
162290 1527:1400-6420,1240-6420,1440-6580
162244 1530:6500-6440,4440-4540,4520-3960

this includes all except for:
-Corrupted Bonestripper
-Corrupted Fleshbeast
-Corrupted Neferset Guard

the 3 NPS are already include in RareScanner

Links

Combating the Corruption

Kill one of every type of corrupted creature in Uldum or Vale of Eternal Blossoms during Black Empire Assaults.

Criteria

	Corrupted Acolyte (1)
	Corrupted Beheader (1)
	Corrupted Bonestripper (1)
	Corrupted Dominator (1)
	Corrupted Fleshbeast (1)
	Corrupted Mind Eater (1)
	Corrupted Observer (1)
	Corrupted Summoner (1)
	Corrupted Thoughtstealer (1)
	Corrupted Watcher (1)

	Corrupted Assassin (1)
	Corrupted Bloodseeker (1)
	Corrupted Despoiler (1)
	Corrupted Doomsayer (1)
	Corrupted Jailer (1)
	Corrupted Neferset Guard (1)
	Corrupted Putrefaction (1)
	Corrupted Thaumaturge (1)
	Corrupted Tormentor (1)

NPCScan

Information and Addon Downloads for NPCScan

/npcscan add 162249 Corrupted Acolyte
/npcscan add 162250 Corrupted Assassin
/npcscan add 162252 Corrupted Beheader
/npcscan add 162290 Corrupted Bloodseeker
/npcscan add 159087 Corrupted Bonestripper
/npcscan add 156709 Corrupted Despoiler
/npcscan add 162246 Corrupted Dominator
/npcscan add 162244 Corrupted Doomsayer
/npcscan add 158632 Corrupted Fleshbeast
/npcscan add 162247 Corrupted Jailer
/npcscan add 162243 Corrupted Mind Eater
/npcscan add 158531 Corrupted Neferset Guard
/npcscan add 162254 Corrupted Observer
/npcscan add 158706 Corrupted Putrefaction
/npcscan add 162251 Corrupted Summoner
/npcscan add 162253 Corrupted Thaumaturge
/npcscan add 162241 Corrupted Thoughtstealer
/npcscan add 162245 Corrupted Tormentor
/npcscan add 162248 Corrupted Watcher

TomTom

Information and Addon Downloads for TomTom

/way Uldum 51.8 46.8 Corrupted Acolyte
/way Uldum 46.2 79.8 Corrupted Acolyte
/way Uldum 47.4 38.4 Corrupted Acolyte
/way Uldum 49.2 85.4 Corrupted Assassin
/way Uldum 46.2 80.4 Corrupted Assassin
/way Uldum 46.4 78.2 Corrupted Assassin
/way Vale of Eternal Blossoms 44.2 69.2 Corrupted Beheader
/way Vale of Eternal Blossoms 42.0 61.0 Corrupted Beheader
/way Vale of Eternal Blossoms 42.0 66.8 Corrupted Beheader
/way Uldum 14.0 64.2 Corrupted Bloodseeker
/way Uldum 12.4 64.2 Corrupted Bloodseeker
/way Uldum 14.4 65.8 Corrupted Bloodseeker
/way Uldum 57.8 35.6 Corrupted Bonestripper
/way Uldum 13.2 68.8 Corrupted Bonestripper
/way Uldum 17.8 67.2 Corrupted Bonestripper
/way Vale of Eternal Blossoms 54.0 42.0 Corrupted Despoiler
/way Vale of Eternal Blossoms 37.4 40.6 Corrupted Despoiler
/way Vale of Eternal Blossoms 40.2 37.4 Corrupted Despoiler
/way Uldum 53.6 43.6 Corrupted Dominator
/way Uldum 51.4 46.4 Corrupted Dominator
/way Uldum 52.4 39.4 Corrupted Dominator
/way Vale of Eternal Blossoms 65.0 64.4 Corrupted Doomsayer
/way Vale of Eternal Blossoms 44.4 45.4 Corrupted Doomsayer
/way Vale of Eternal Blossoms 45.2 39.6 Corrupted Doomsayer
/way Uldum 59.8 49.4 Corrupted Fleshbeast
/way Uldum 43.2 28.4 Corrupted Fleshbeast
/way Uldum 44.6 30.4 Corrupted Fleshbeast
/way Uldum 60.6 71.6 Corrupted Jailer
/way Uldum 61.4 66.0 Corrupted Jailer
/way Uldum 61.4 75.2 Corrupted Jailer
/way Uldum 55.0 53.2 Corrupted Mind Eater
/way Uldum 44.4 29.8 Corrupted Mind Eater
/way Uldum 46.0 30.0 Corrupted Mind Eater
/way Uldum 50.4 84.8 Corrupted Neferset Guard
/way Uldum 47.4 78.2 Corrupted Neferset Guard
/way Uldum 47.4 80.4 Corrupted Neferset Guard
/way Uldum 54.2 51.6 Corrupted Observer
/way Uldum 54.8 49.4 Corrupted Observer
/way Uldum 55.2 53.0 Corrupted Observer
/way Uldum 56.6 34.0 Corrupted Putrefaction
/way Uldum 54.4 32.0 Corrupted Putrefaction
/way Uldum 54.4 49.0 Corrupted Putrefaction
/way Uldum 60.2 49.4 Corrupted Summoner
/way Uldum 47.8 84.4 Corrupted Summoner
/way Uldum 49.8 73.4 Corrupted Summoner
/way Uldum 47.2 78.2 Corrupted Thaumaturge
/way Uldum 46.2 81.4 Corrupted Thaumaturge
/way Uldum 46.4 83.0 Corrupted Thaumaturge
/way Uldum 62.4 75.2 Corrupted Thoughtstealer
/way Uldum 52.0 48.4 Corrupted Thoughtstealer
/way Uldum 53.2 50.8 Corrupted Thoughtstealer
/way Uldum 45.8 93.8 Corrupted Tormentor
/way Uldum 12.4 71.2 Corrupted Tormentor
/way Uldum 13.0 64.8 Corrupted Tormentor
/way Uldum 50.8 69.6 Corrupted Watcher
/way Uldum 50.0 78.6 Corrupted Watcher
/way Uldum 50.4 80.2 Corrupted Watcher

Guides

Rewards from N'Zoth Assaults - Mounts, Pets, Toys Visions of N'Zoth Assaults Guide - Uldum and Vale of Eternal Blossoms Invasions

Combating the Corruption

Criteria

NPCScan

TomTom

Guides

Related

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