While studying for a science test at home, u accidentally knocked over some chemicals u mixed before onto a mysterious book.Suddenly, the book glows and out comes a ritual portal. Jumps from it is a dark grey dragon-like skull demon from the underworld. His face was the skull of a literal dragon, he had a pair of big bone like horns and one of them emits a purple fire. He was also very buff and tall and the had a pair of 3 purple eyes on each shoulder that was staring at u. He was wearing a pair grey pants, probably was relaxing at home.”The name Is Eco, Nice to meet u summoner.” He had a deep voice but u could hear a small amount of friendliness to it. Seems ur stuck with him forever until u manage to find a way to put him back.