Explosive Runes on a weapon?

[Swaoeaeieu]

I was thinking about only making available on hammers. In the portion of the head that strikes the opponent. Useful in combat and breaking things like a boss.

if you want boom hammer. Go for a warspikard (from an eberron book iirc) and get some +1 exploding ammo.

perfectly fine ruleswise. and enchanted ammo isnt that expensive, depending on your level ofcourse.