@elijiahrave
I was thinking about that too. Why would they allow a skill to one-shot Demon and Mutant type bosses who make up 51% of the 200+ unique bosses. Then I read this line:
“May kill mutant or demon type enemy at once.”
I’m guessing a pretty slim chance here. I’d like some one to test this. But, it’ll require patience due to the 100 sec cooldown time
EDIT: Also what was seen in the beta test, where bosses who where immune to many spells like Petrify,Sleep in general with specific bosses immune to stun,freeze,burn,poison etc. So i’m guessing that all bosses will be immune to one-shot kills too.