Filling the Tanks

This quest item drops from the Oily Invertebrate from the Mixed Monstrosities pool at Plaguewatch in Maldraxxus.

To spawn the Oily Invertebrate, you'll need to put 10 red, 10 yellow, and 10 blue slimes into the pool.

Once the quest item drops, you'll be asked to kill various slimes across the Shadowlands.

Maldraxxus:

Volatile Jelly can be found in the uninstanced version of the Plaguefall dungeon.
If you're unfamiliar with getting there, you'll need to head to 59.7, 71.2 at Plaguewatch and talk to Pandemis who will give you a mask that grants you a Personal Air Filtration buff to survive the caustic fog. Then use the portal pad next to him and head to around 70.4, 72.9 to find the Jellies.

Constructed Ooze can be found in the Stitchyard (Northwest corner of Maldraxxus) in the House of Constructs. Specifically search in the "waters" around the area.

Bubbling Sclerosis can be found in the uninstanced version of the Theater of Pain dungeon. They'll be around the edges of the arena inside.

Bubbleblood can be found at 52.5, 35.4. This is a beefy rare that can be difficult to solo and may not always be up.

Bastion:

Necrotic Droplet can be found near the entrance to the Necrotic Wake dungeon in Bastion. Hang a left or right down the stairs on either side of the dungeon entrance and look around for the green pools of slime.

Bubbling Purity can be found at 57.1, 77.1 in Bastion.

Revendreth:

Primordial Sludge can be found all around 35.5, 32.7 in Revendreth.

Congealed Ash is an elite mob that can be found at 25.6, 55.2 in Revendreth.

The Maw:

Resonant Misery can be found all throughout the River of Souls in the Maw. If you're not familiar, it's the place in the Maw that's bright as all hell and very, very white.

Dungeon:

The last part of the quest is to simply kill the last boss of Plaguefall, Margrave Stradama. This appears to be able to be done on any difficulty. Although, I'm not entirely sure if it can be done via a mythic+ run.


/way Maldraxxus 66.3, 79.7 (Volatile Jelly)
/way Maldraxxus 26.8, 28.7 (Constructed Ooze)
/way Maldraxxus 50.3, 47.3 (Bubbling Sclerosis)
/way Maldraxxus 52.5, 35.4 (Bubbleblood)
/way Bastion 38.0, 52.0 (Necrotic Droplet)
/way Bastion 57.1, 77.1 (Bubbling Purity)
/way Revendreth 35.5, 32.7 (Primordial Sludge)
/way Revendreth 25.6, 55.2 (Congealed Ash)
/way The Maw 36.7, 26.1 (Resonant Misery)


I received the Recovered Containment Pack today after killing the Oily Invertebrate. I was level 60 and have Bastion as my covenant. Others who killed it with me did not receive it (two kills, around 10 players total - I got it on my first kill of the day).

(Here is my armoury where you can see it's transmogged, showing I do have it.)

The pack is a drop from Oily Invertebrate at the (Mixed Monstrosities) slime pools in Maldraxxus and although I happen to be a Necrolord it doesn't matter which Covenant you are in order to obtain the pack.

[npc=157312] is the mob you need to summon
In Maldraxxus at the slime pools (Plague Watch flight point)
/way 58.6 74.2

To summon Oily Invertebrate you need a total of 30 oils on Pool of Mixed Monstrosities in the following proportions:
10x Viscous Oil 10x Mephitic Goo 10x Miscible Ooze. (10 of each color)

Viscous Oil drop from Burning Extract and Colossal Plasma. Around /way 60,0, 76,0
Miscible Ooze drop from Diseased Remnant and Infectious Monstrosity. Around /way 57,8, 65,6
Mephitic Goo drop from Colossal Goo and Prodigious Animate. Around /way 61,2, 79,0

The turn in is to Boil Master Yetch at the pools
/way 59.12, 73.83

Slay Volatile Jelly in the House of Plagues - In Maldraxxus (SouthEast - Plague Watch flight point) appx /way 66 74
You can talk to [npc=161841] if you need protection from Caustic Fog

Slay Constructed Ooze in the Stitchyard - In Maldraxxus (North West - Spiders Watch flight point) appx /way 23 36
Around the back side of the Stitchyard

Slay Bubbling Sclerosis in the Theater of Pain - In Maldraxxus (Middle - Theater of Pain flight point) found inside the arena in the area's between the stairs

Slay Necrotic Droplet in the Temple of Courage - In Bastion (Middle West along the edge - Temple of Courage area the closest flight point is either Aspirant's Reach or Hero's Rest, neither is super close) appx /way 38 52
To the right of Necrotic Wake entrance in the area where the Bastion summoned rare is

Slay Primordial Sludge in the Blistering Bog - In Revendreth (NorthWest - Dominance Keep flight point) appx /way 33 31
On the backside of the wall

Slay Bubbleblood in the Forgotten Wounds - In Maldraxxus (middle North - Keres' Rest flight point is closest) appx /way 52 35
He is a relatively constant spawn, if he's not up just wait a little bit or look in group finder

Slay Resonant Misery in the Maw - In The Maw https://www.wowhead.com/npc=169780/resonant-misery [npc=169780]
In Gorgoa:River of Souls

Slay Congealed Ash in the Ember Ward - In Revendreath (SouthWest corner - Sanctuary of the Mad flight point) appx /way 25 55
Around the backside of the wall in a pool

Slay Bubbling Purity in The Temple of Purity - In Bastion (SouthEast along the edge - Aspirant's Rest flight point) appx /way 57 77
Near Beasts of Bastion World Quest

Slay Margrave Stradama in Plaguefall - The Dungeon, the last comment I saw said Mythic Plus did NOT count but Normal did, I did this on Normal and it counted.
While you're in Plaguefall don't forget to pet Hairball for the Nine Afterlives Achievement