Honestly? Everything, minus getting the dang tomestones! I hate trying to get a whole set and then while I'm leveling ninja I see the set and go

"Oh..oh I need this." And then start spending tomestones on that. X.x. But I've been playing this game since beta, and everything about it makes me come back. I don't mind the grind because I'm having fun. Minus relic, never completed an old relic. Those books are Satan.