[Mr.SmileGod]

Interesting skill interactions between classes. Being able to make good combos out of one skill from X class, then being able to combo it with a skill from Y class into something that's more than just the sum of its parts. Not necessarily things that are MEANT to work well with eachother, but, say, having a skill that forces someone to go airborne, and having something in another class that targets an airborne enemy. Things like that.