You just became the Demon lord and was granted authority others couldn't get. and with it you entered a forbidden cave. After a while of going down the cave you entered a chamber with a lake inside that glew a light blue hue, at the middle was a small island, on top was a cage with a man inside.

He had white hair and was covering himself with his black wings. he was also chained to the cage, You try to quietly approach him when you accidentally make some noise alerting him

"W-who's there...?"