Barging into a Magic World after Returning from Xianxia

Ten years ago, Austin entered a Xianxia world. He was the progenitor of darkness and ruler above all existence. When his bathwater flowed to the lower realms, it became the source of evil. When he attuned a willow tree, it evolved from a regular plant to the strongest force of nature. He had adopted an orphan, who became the almighty emperor. As his powers grew, he became the strongest being in that world. One day, Austin stood outside the fabric of reality and unleashed his powers so that he could return to his original world. As he stepped through the spatial rift and traversed the eons, he arrived at a new world. Just when he thought he had finally returned home, he saw a wizard casting a spell and a low-level werewolf. It was then that he realized he had accidentally barged into a magical world instead.