Great Soul, Great Purpose

As of 9.1.5 I was able to solo as a BM hunter, decently geared (250ilvl).

At the very edge underneath the Engine of Souls there will be a yellow swirl at the start of the fight, you will have to stand in it. At the same time as you're doing that just full nuke the Engine and the 2nd boss (the Desolate Host) ASAP.

If you had enough DPS and got the swirly, you should get the achievement. Got it on my first try with ~100k DPS, fight was 13 sec long. Honestly have no idea if it was close or not.

This was done on normal difficulty.

The soul drops underneath the Engine at the start of the fight. You have to catch it, and a few seconds later it launches itself a random direction up to 20 yards away, which has to be caught by a different person in the spirit realm. The soul then bounces back and forth between the realms, but requires two people alternating catching in each realm (4 total). Damage taken or abilities used do not interfere with the mechanic; you simply have to juggle it throughout the encounter.

At the start of the fight a soul falls down and a player has to catch it by standing in the swirly yellow circle underneath the [npc=118460].
After that, every 5 seconds the soul will be launched in a random direction and a player from the opposite realm has to catch it.

You will have to assign two people in each realm because the same person cannot soak two times in a row. The reason you do that is because if one of the players has the "soul" above their character that means they recently caught it and are unable to do it again until someone else from the same realm catches the soul.

Soak Rotation

1. Soaker 1 - Corporeal Realm
2. 
   
3. Soaker 1 - Spirit Realm
4. 
   
5. Soaker 2 - Corporeal Realm
6. 
   
7. Soaker 2 - Spirit Realm

Tips

• To make soaking easier, assigned players have to be marked and once they catch the soul they should always move towards a marked position such as the center of the room.
• 
  
• Soakers should also watch out for the [npc=119938] as as he will periodically cast [spell=235956], a spell that will knock them back if they get hit by the fel waves.
• 
  
• Everyone affected by [spell=235989] should move as far away as possible to avoid placing a wedge of shadow goo on the ground where the soul is supposed to be caught.