It's In The Mix

[npc=165146] is located in House of Plagues, south of the Maldraxxus Plague Watch windrider.

Achievement: https://www.youtube.com/watch?v=vrNXYPwPlII
Pool explanation : https://www.youtube.com/watch?v=9Ybq6V6GBGA

1. 
   
2. Mobs in the area drop glowing objects on the ground after death.
   It is not personal loot, everyone can interact with the object.
   
   • 
     
   • [spell=306722] drops from [npc=165027] & [npc=166438] (Red slime mobs south of the Pool)
   • 
     
   • [spell=306719] drops from [npc=165015] & [npc=171142] (Blue slime giants south of the Pool)
   • 
     
   • [spell=306713] drops from [npc=167923] & [npc=167948] (Yellow slime giants north of the Pool)
   • 
     
3. 
   
4. Your objective is to pick up the item and bring it to the pool.
   /way 58.21 74.23 Pool of Mixed Monstrosities
   
5. 
   
6. After you bring 30 items to the Pool, it spawns a rare
7. 
   
8. If you manage to bring the correct combination of ingredients it should summon 1 out of 7 rares for It's In The Mix achievement.
   The main problem is that's it's group event and everyone can participate and ruin your setup.
   Here is the list of combinations and loot of rares you can summon:
9. 
   
   

ID

Rare

How to summon

Reward

Fastest Proportion

Kill Video

1

[npc=157309]

Blue = Red > Yellow

[item=182079]

15xB 15xR 0xY

https://youtu.be/OSVT1JwpV14

2

[npc=157310]

Blue = Yellow > Red

[item=184185]

11xB 8xR 11xY

https://youtu.be/WxH2adUMsdY

3

[npc=157311]

Red = Yellow > Blue

[item=184185]

8xB 11xR 11xY

https://youtu.be/hIQxaKQwurI

4

[npc=157294]

15+ Red

[item=184279]

0xB 30xR 0xY

https://youtu.be/lhjANKDXIB8

5

[npc=157308]

15+ Blue

[item=184300]

16xB 14xR 0xY

https://youtu.be/9TInRYHcxzk

6

[npc=157307]

15+ Yellow

0xB 14xR 16xY

https://youtu.be/nyBAzRQ79d0

7

[npc=157312]

10 Red 10 Yellow 10 Blue

[item=181270] pet & Mail Feet

10xB 10xR 10xY

https://youtu.be/RXfbC8-Dbnc

Hints:

1. 
   
2. Achievement can be done in 1 day.
3. 
   
4. Pull mobs as close as you can to the [npc=165146] before killing them,
   This will reduce the amount of time you have to spend substantially
   For example here we killed red mob right next to the pool: https://youtu.be/vrNXYPwPlII?t=823
   And here is blue mob closest kill we could manage: https://youtu.be/vrNXYPwPlII?t=1146
   You can pull yellow mobs up to the windrider to make the process faster : https://youtu.be/9Ybq6V6GBGA?t=75
   
5. 
   
6. Most speed buffs work, you can even use mounts and they should speed you up a little bit
7. 
   The main problem is people doing daily quests Mixing A Mess and Pool of Potions in the area.
   
8. If you don't see the items on the ground after kills, complete the questchain in the area
   
   1. 
      
   2. A Plague on Your House
   3. 
      
   4. Pool of Potions
   5. 
      
   6. Callous Concoctions
   7. 
      
   
   Or you can wait for a world quest Mixing A Mess
   
9. 
   
   

The final reward is [item=183903] and here is how it looks.
Here is toy demo: https://www.youtube.com/watch?v=xIYuH4WPfx4

This is next to impossible right now. Because there's a daily to throw slime in the pool, and no way to stop or correct it, people keep throwing in too much red or too much blue and screwing it all up. This is horribly designed.

Dragonriding mounts do not get slowed like normal mounts, so it is much faster now