Armored Demon is an enemy from Find Mii. Armored Demon is encountered first in Mirage Tower 1F. He has 25 HP in Find Mii and two are encountered in the second-to-last room (Mirage Tower 3F). That room is dark, so you need a white shirted hero to brighten the room. In Find Mii II he has 40HP. He is encountered in Castle of Darkness-Throne Room in the regular quest with Reaper Captain and in the secret quest with Reaper Commander. If you take the Restless Rise path in the secret quest, you must defeat him to rescue the prince/Princess.