Mmoexp Diablo 4 Items: Burning Aether Currency
Burning Aether Currency:

As you fight, you’ll earn Burning Aether, which can be spent after the run to unlock rewards and Spoils of Hell.
Burning Aether also provides a chance to obtain new Uniques and Legendaries.
The Fell Council – Boss Mechanics
The final wave of Infernal Hordes pits you against The Fell Council, a group of five powerful priests with unique abilities.

Fight 3 Random Members:
Each time you enter an Infernal Hordes run, 3 out of the 5 Fell Council members will be selected at random.
As the fight progresses, the priests frenzy, increasing their attack power and abilities the closer you get to defeating them.

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