"Increases your critical hit rate by 100%" would mean "you will always get a critical hit" though. That's not confusing wording. "Doubling" is implicitly multiplicative, whereas "increases" is implicitly additive.

The thing is that ALL buffs in this game are additive, they just add in different ways, based on common sense. If you "increase" your "rate" by x%, it's just an additive increase of that %. If you "increase" your "value" by x%, you increase that value by an amount equivalent to that % of the value. It's addition mixed with multiplication, but still addition at the end of the day.


It's not even taking tooltip text to be the word of law, to be honest. It gives strict %'s which are guaranteed to be correct, save for a mis-translation error, and those %'s can be directly inferred to have certain properties.

To assume that a 30% damage increase stacks with a 20% damage increase in such a way that the end result is a 50% (rather than 56%) damage increase is a little bit silly! That would be counter-intuitive to the idea of increasing damage. If you simply think logically for a moment about what it means to "increase your damage by a certain percentage" it stands to reason that one buff would stack multiplicatively on the last.


It's all logical and intuitive the way I outlined it, and there has been countless research done by people much smarter than I am that verifies what common sense dictates.