I was thinking earlier about gear and how a lot of times it just seems like something we throw away, of course i was also playing destiny at the time i thought about this. All the great weapons in fantasy have renoun for doing certain things like killing hundreds of goblins, ie foe hammer from lord of the rings. What if our gear could do something like that. with each kill our gear gets a small amount of xp. this could translate to increases in say armor and trait/set bonuses on crafted gear to even new abilities on unique weapons like daedric artifacts