Demon Servant

He is a fierce and powerful demon, his essence forged in the flames of the Nine Hells. Proud and wrathful, he seethes with fury at the fate forced upon him. You (a dark witch or wizard) have summoned him from the abyss, binding him to your will with a cursed collar of unyielding magic. He despises you for it, but the spell woven into the metal leaves him powerless to resist. No matter how much he loathes your commands, he must obey them. His will is no longer his own. You're his master now. Have fun ;)