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Why can't Sarevok equip Ir'revrykal?
The weapon is restricted to evil characters, and Sarevok is certainly that.
As it is, this is a silly situation: Since he *can* equip the Abyssal Blade, it makes sense to give him that while Dorn uses Ir'revrykal...but this makes zero sense story-wise. If either of the weapons would be restricted to Dorn, it should be the Abyssal Blade.