From The Belly Of The Jelly

There are a new group of pets available with the same listed source. These 'slimy' pets all have the same source - the 'Slimy Cocoon'. Apart from all sharing the same source, these pets share a similar model theme. This currently does not show up properly on the Wowhead model viewer. Every pet has a blue appearance, with a particle aura. There is also an achievement tied to obtaining one of these pets, From The Belly Of The Jelly.

Slimy Pets

• [npc=151651]
• 
  
• [npc=151697]
• 
  
• [npc=151696]
• 
  
• [npc=151632]
• 
  
• [npc=151673]
• 
  
• [npc=151700]
• 
  
• [npc=151631]

How to Obtain

Make sure you have done Nazjatar up until you have unlocked world quests.

1. Complete the quest A Curious Discovery / [quest=56560]. This can be found at any of the waypoints listed below, in front of each [npc=151782]. After completing this quest, you will receive one [item=167893], and you will now be able to pick up [item=167893], which are objects located throughout the zone.
2. 
   
3. Now, you feed the [npc=151782]. You can feed all four at the same time. You do this by charming a critter using [item=167893], and bringing it back to a [npc=151782]. You have an hour to do this. The critter can not be a water bound one (the fish critters).
4. 
   
5. Do this for five days total (in game, resets on daily quest reset), and the Slimy Cocoon will hatch into one of the battle pets. It seems to be random as to which one it is, and does not depend on what you feed the [npc=151782].

I have found [item=167893] are mostly found near waterfalls and rivers. They look like the purple crystals from the Long Forgotten Hippogryph event, and are quite noticeable.

They are all cageable, and you can buy or sell them on the Auction House. You can also do this on multiple characters at once.

/way 32.92 39.77 Ravenous Slime 1
/way 45.71 24.09 Ravenous Slime 2
/way 71.71 25.69 Ravenous Slime 3
/way 55.13 48.77 Ravenous Slime 4

User Protozoid has provided some waypoints to [item=167893]:

/way Nazjatar 46.80 52.13 Prismatic Crystal
/way Nazjatar 45.80 42.41 Prismatic Crystal
/way Nazjatar 45.80 38.10 Prismatic Crystal
/way Nazjatar 46.50 36.10 Prismatic Crystal
/way Nazjatar 39.10 59.50 Prismatic Crystal
/way Nazjatar 29.99 36.06 Prismatic Crystal (behind the Staghorn Reefwalker)
/way Nazjatar 29.50 36.08 Prismatic Crystal
/way Nazjatar 38.72 18.15 Prismatic Crystal
/way Nazjatar 42.21 17.95 Prismatic Crystal
/way Nazjatar 44.72 21.11 Prismatic Crystal (check top and bottom of waterfall)
/way Nazjatar 70.31 24.81 Prismatic Crystal
/way Nazjatar 71.96 22.51 Prismatic Crystal
/way Nazjatar 73.40 50.50 Prismatic Crystal
/way Nazjatar 48.27 28.15 Prismatic Crystal
/way Nazjatar 31.31 35.54 Prismatic Crystal
/way Nazjatar 47.23 69.05 Prismatic Crystal
/way Nazjatar 50.11 72.63 Prismatic Crystal

Update: I left the eggs for two days, and picked up right after. They continued the cycle. You do not need to feed them for days in a row.

Credits to Lazey for finding this.

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For a complete summary on how to collect the pets of Nazjatar, you can visit my guide - [guide=8360]!

Wanted to add the 5 days DONT have to be consecutive.

I got it today after I missed the 5th day in the row. My selfish wife decided she wanted to have a baby then and I missed out. But I came back today and found on the 6th day I still managed to get the pet!

Edit: She read this. I wont be able to enjoy the slimy hermit crab for a while...

Repeat after me: Do _NOT_ aggro the Wife-Boss in Ultra-Hard Mode! ;-)