he was in need to become a new king, so he was in need of almighty demon who would serve him forever

He drew a pictogram, lit up the candles... Cast a spell and... WHY!? WHY IS THE DEMON SO SMALL!? IT LOOKS TO BE 14 YEARS OLD AT MAX!

"The hell I got!? I wanted almighty creature!" "..." "... alright, you can stay with me and live in my mansion for now."