I'm making a passive warlock tank. The idea being that I cast Armour of Agathys for the temporary hit points and the Mirror Image to keep me alive longer. It will be a solo NPC opponent for a 5/6 PC party.
Mirror Image makes 3 duplicate that are indistinguishable from me so I would assume they have the frost aura protecting them as well.
Is this correct? Would a PC making a melee attack against a mirror image take 5 frost damage?