Life After the Nine-Tails Became Invincible

At the beginning of chaos, at the dawn of the universe, a nine-tailed fox was born. His name was Yu Chen. After completing his path of cultivation and defeating the Heavenly Dao of his world, he became invincible, though he couldn't say how much time had passed. The powerful beings of the universe chose him as its ruler, and he established the Supreme Hall to manage both the universe's major affairs and its everyday matters.

Sometimes he takes on disciples; sometimes he looks after his sworn younger sister...

He never lost his interest in finding ways to have fun, until he came across a new term: slacking off... (The first 20 chapters set things up. After that, each world gets a long story arc.)