Seeking Clarification

Yes, I know there's a Resistance section. However, I'm posting this here because it's a question and because more people frequent this board.

Is the Mechanic's Metal Fist Mastery additive or multiplicative?

Common sense dictates that it is additive (or Atomic Hammer would become 645% damage; beyond overpowered), but I just want to be sure.

If it is additive, then...

Atomic Hammer's only advantage over Rocket Punch is its much larger vertical range and ignore WDEF property, right?

"Level 20 - Damage: +50% (for both skills)"
I'm going to agree with you on that it is additive, because like you said, multiplicative would make Hammer just way too good.

As for the second part, no idea, as I haven't played a Mechanic, and with things like that, seeing it in action is always better than just seeing the math behind it.

Additive. Otherwise, A-hammer damage would have been nerfed already.