If HP decreases too quickly, then the monster enters the berserk state. MC already had the calculations so that the damage isn't too high. But +100% buff ruined it, and it was never enough to one shot the boss
I really hate that f maid. Usually a lowly maid rude toward duke family can be killed right on the spot. Another f that judging people from rumor pretty much not a good person. When you apologize look directly right at their eye scum! What a insincere apology. I really miss WQ. if its him he will kill any trash he meet. Afterall its better than sorry.
Even killers and demons can be wholesome at times.