I had an idea for a homebrew rage power, and wanted to see what you guys thought:
Cool sounding rage power name (Ex): Once per rage, if a barbarian takes damage to a physical ability score (Strength, Dexterity, or Constitution), he may exchange each point of ability damage for 1d6 hit point damage. A barbarian may opt for a partial recovery of the ability score for less damage. A barbarian can only apply this rage power to one ability score per rage. This rage power costs a swift action.
Example: Gartok the Berserker as a Str 22 (while raging) and at 51/57 hp from a few zombies he had to deal with. Presently, he is hacking at the necromancer. The necromancer Bestows a Curse on Gartok, and the barbarian takes 6 Str damage (Str now at 16). At the beginning of his turn, Gartok can use a swift action to (1) trade the 6 Str damage for 6d6 hp damage, or (2) trade less ability damage for less hp damage (such as 3 for 3d6).
Gartok has had enough. He converts the 6 ability damage to 6d6 ⇒ (5, 1, 6, 4, 5, 1) = 22 hp damage. It hurts, but now Gartok can keep on doing what he's good at: breaking things. [/example]
Not sure if this rage power should apply to ability drain. I just wanted to check and see if I was missing something about this that was OP. I know it's a little weird because hp is an abstraction of health, and suddenly deciding that getting stabbed through the bicep is only going to affect your general well-being instead of how hard you hit can be a bit wonky. Maybe I'm over-thinking it.
Maybe it could even lead into a rage power progression that more or less gives a meat version of Lesser, Standard, and Greater Restoration? I don't know. What do you guys think?