User blog comment:Qwertyqaz/Leveling destruction/@comment-2041192-20111207211551

Horrible grammar and spelling aside, I'm pretty sure you get a little experience for the damage you do, and then a lot more experience when you actually get the kill. Destruction is a lot harder to level up than conjuration or alteration are, because you actually have to hurt an enemy to get experience (Similar to melee stats). Again, that's just what I think. There might be something else, I haven't had a chance to explore it in depth.