The Acidic Mass  

Acidic Mass Ring Event

On the north side of the central pyramid, a single a swirling ooze sits. If you kill this ooze, you begin a heroic ring event that spawns a series of monsters resulting in a final named monster as follows:

1. 1 a swirling ooze (46^^^ Heroic)
2. 1 a bubbling ooze (47^^^ Heroic)
3. 2 a bubbling oozes (47^^ Heroic)
4. 3 a bubbling oozes (47^ Heroic)
5. 4 a bubbling oozes (47^ Heroic)
6. 2 a boiling oozes (48^ Heroic)
7. 3 a boiling oozes (48^^ Heroic)
8. 4 a boiling oozes (48^ Heroic)
9. The Acidic Mass (49^^^ Heroic)

This Ring Event is part of the quest, The Heart of Fear, but can be completed without having the quest.