The Void Dragon God

This is the story of Rimuru Tempest, he was the strongest being to ever exist and the oldest. he was bored because he was the only one in the void so he created veldanava his little brother, after that due to unfortunate circumstances he has to go into a deep sleep after he woke up he finds himself in a strange cave. what will he do? and will everything be the same? I don't own ten