The Damage Resistances for a 5E Imp are:
Cold; Bludgeoning, Piercing, and Slashing from Nonmagical Attacks that aren’t Silvered
Would this Imp be resistant to damage from a Mace of Warning?
- You could argue "Yes" because any Weapon of Warning should be considered a magical weapon, and therefore the damage it deals is considered magical.
- You could argue "No", with a liberal interpretation of the resistances, because the mace is not silvered.