Would an Imp be resistant to the bludgeoning damage from a Mace of Warning?

Question

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.

Answer 1

A Mace of Warning is a magical weapon that deals magical damage.

From the description of Weapons of Warning:

This magic weapon...

Since it is a magic weapon, it deals magical damage, as the Monster Manual says in the section on Vulnerabilities, Resistances, and Immunities:

a magical attack is an attack delivered by a spell, a magic item, or another magical source

Therefore, the Imp would not be resistant to damage from the Mace of Warning since it deals magical bludgeoning damage and the Imp has resistance to non-silvered, non-magical bludgeoning.