The PWR x 0 isn't a typo, odd as that is. Since the actual ability belongs to increases Fire damage by one or more steps, we figuring having it start at 0 was a less ambiquitous wording than starting at PWR x 1, and then trying to figure out if the ability increased that or not.

Runic is a Red Mage's innate, but you probably guessed that. I'll make sure I label that asap.