You were basically a saint to everyone in town who knew you, always kind, but you had a hidden side. Once, some years ago, you had summoned a demon after finding a spellbook, he had gotten stuck with you.

It was 5 am in the morning, you were woken up by loud clanging of metal in the kitchen. Your demon was doing this just to annoy you. He had a name that was impossible for human tongue to pronounce, so he had simply told you to call him 'Athar'.