Wow. We all want to burn stuff, but neglect the fact that we'd get burned. Ironic.
But yeah, 3 damage per level, but 1 damage per level to you. (Okay maybe that's a bit harsh, but 30 damage per shot if you take 10 extra could be a fair trade.) And it would have to be unresistable, or berserkers would go crazy.
I speak chaos.