Make it where godenchanted weapons can only be wielded by characters who worship the god the weapon is enchanted of.
This way, only people who actually worshipped valkyrie could use the ultimate valkyrie enchanted weapons. Valkyrie gives a extremely powerful weapon enchant, but balances it out by making worshippers of valkyrie not able to use any magic. Well, a character who worships another god can always have a valkyrie weapon made and then wield it, getting the ultimate power of a valkyrie weapon without the negative's to balance it out.
Making it where you have to worship a god to use a weapon godenchanted of it would balance out issues like this, and also it just seems to make sense as other gods are sometimes jealous when they see you using items from other gods.
*actually have to worship valkyrie to use awesome valk weapons...
*actually have to worship devourers to get the powerful lifestealing attacktype...
etc. (those are the most notable 2 though)
Also note that godenchanting in 2.0 doesn't work correctly in 2.0 (at the time I posted this) yet. See the bug post '2.0 godenchant bug?'.