Alchemy or some kind of create item skill. I love those in a RPG. Might be a pain in the behind to code, but you did say you're looking for suggestions
I'd guess you already have healing health, regenerating magic points or however you call it in the game.
Other suggestions might include pickpocketing, create diversion, ambush, hide in the forest/night/cave/… , potion making
More combat related: Shield bash, poisoning(losing health and/or abilities for a period of time/turns), bad/good luck (bad luck makes you lose your weapon, hurt yourself, or other things. good luck means you make a critical hit hurting the other more, make the other lose its weapon or break his shield…)