I see both sides of this. I personally wouldn't mind such items, and I don't think my players would, either....but it's easy to imagine some that might. If they see weapons that clearly have cool abilities, they tend to want those as a reward when they defeat the enemies.I think in such instances, it makes more sense to put the ability in the creature rather than their gear. Why not just give the monster a +2 to hit and damage? Or in the case of more specific properties like hte flaming whip of the Balor, have the special property granted to the weapon by the creature.
Seems pretty straightforward.
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