MutantWafflez
Spazmatism
Don't have any solid debug info for you but while merciless is installed, sometimes things will take a bajillion ( several hundeds of thousands ) damage when they should only take like 600.
And this happens some time into playthrough pretty randomly and lingers on the save until this mod is removed.
I accidentally 1 tapped king slime cus of that and now he's cleared on my boss list but I can barely scratch him under normal circumstances...
Oh boy that's a major issue. Are you able to discern any pattern at all? Any weapon in particular that you noticed that triggered it? And when you said it lingers on the save, do you mean that once it happens, ALL weapons do absurd amounts of damage until the mod is disabled?