Cool icon. APproved.

If i may, i think the axe and lightning blend a little too much, not distinctive enough, and the axe does give somewhat of a pickaxe feeling at first glance. i may be blind (you know me) but i found it hard understanding the shape of the axe.

I was about to suggest Metalstorm as a name idea but i guess Bladestorm exists so this is perfectly justified.

Nice!