Torghast, Tower of the Damned

End game zone in WoW - Shadowlands

The Purifier's Flame anima power turns the Deadsoul death pools into health regenerators. You can get it as a random drop or by throwing an Ravenous Anima Cell on one of these mobs:

In Soulforges, using the Ravenous Anima Cell on one of the following mobs gives you a fire immunity anima power:

Using this item which you can buy from a broker in the tower can give you very helpful anima powers, especially in Soulforges and Mort'regar.

See this WoWhead comment for details.