[--Chris--]

I don't like it x.x

Just imply the slaying option already. When someone worships your enemy God a weapon blessed by your God would have a slay <characterr type> atrribute, that attribute is any player that worships the enemy God.

Example: Aengus' enemy God = Ogma.
Ogma's weapon has slay faerie/dwarf there-fore Ogma's weapons will do more damage to Aengus worshippers.