Well, my magic system is sorta self explanatory. The longer you are alive, you are able to access more of the magic as well as you are more powerful.
On a shard to shard fight, Experience would just taunt Frustration until they got to frustrated to fight. On second thought though, it seems like the more frustrated you are the more powerful you are. So I guess Experience would just fight you, and the longer the fight goes the better, because they get more Experience.