doom eternals ancient gods part 2 final level, the final boss. The whole game is about being aggressive, fast which the final boss goes against because if you don't shoot the boss is open after using a ability if heals them which no other bosses does then after you do manage to do it after times the boss summons the hardest (arguably) enemies in the game which is vulnerable to the same ability you need for the boss which means you cant do anything until you regain it. So for me i was stuck in the loop or surviving the boss but cant risk attacking because if i`m off by a few seconds the bosses heals and it makes the already frustrating fight longer