"Core" map boss empowered by Affliction league mechanic

Eater of souls (Act 4 Malachai) in Core map is being empowered in the first phase of the fight, when Piety helps us and he is unkillable, but after transitioning to the actual boss arena, boss is no longer empowered.

UPD: Upon further testing, on both arenas the boss can be empowered by wisps. However the bosses on arenas are different moster entities, as they can be empowered by different wisps.
I think, first boss should never get empowered buff, as he doesn't drop any loot, just makes the fight harder for no particular reason.

Getting the game harder without getting anything as reward is GGG philosophy tho...

You have chosen a wrong thread to be bitter, I'm not on the complaining train. I think, for loot showers I get this early in the league, difficulty level is totally correct, apart from some obvious bugs (ahem, double-empowered essences, ahem). Uniques echoing in my headphones is very satisfying.