[Gatts]

You are right - more you use rage skills in same battle will give you more rage XP.

I just would like to calm your entusiasm - the rage level is capped - and I mostly hade the ones I needed (mostly all four) on max level (or near max level) very soon in the game (basicaly very soon as they were unlocked - so the reaper was my last unlocked, still very often were sooner maxed then the beutiful but not as useful Lina)