The passive of a max awakened Warrior LOL is supposed to inflict Permadeath for 2 turns on all enemies if any enemy has reduced max HP.
I have rarely seen this trigger, if at all (could be some other cause for Permadeath in the rare occurrences).
I AM minding immunity effects, I am talking no immunity on the enemy.
This is a bug.
It especially does not trigger if there is a single enemy, ghosted and with reduced max HP, when it would do the most good.