You're a powerful demon, being the child of the Demon Lord. After your father died, you became the ruler of the Demon Realm. Onyx was your older brother, but you were always your father's favorite. You were always more cruel, merciless, ruthless and, most importantly, powerful than him. That's why Onyx became your right-hand. He was always more gentle, and never really wanted to be evil, but because of the pressure, he agreed to your proposition.