Half a clear breeze

Chu Xuan transmigrated to a fantasy world and became the young master of a powerful family. He was rebuked for misbehaving just because he sneezed during a banquet. As punishment, he was banished from the ancestral mansion and was relocated to a remote residence.
He did not mind the punishment at all. He just needed a spot that could allow him to be a shut-in. With the system that would allow him to grow stronger by being a shut-in, the longer he stayed indoors, the more powerful he became.
After being a shut-in for a day, he was rewarded with the Indestructible Body Technique.
After being a shut-in for a month, he was rewarded with the Immovable Mountain Technique.
After being a shut-in for a year, he was rewarded with the Yuxu Celestial Scripture and 100 years of cultivation.
After being a shut-in for 10 years, he was rewarded with the Chaotic Indestructible Body and the Bell of Chaos.
…
Chu Xuan declared, “No one can make me leave my home. I like being a shut-in!”

I Stayed At Home For A Century, When I Emerged I Was Invincible

As for the demon ancestor implying that there were other ways to kill him, Qin did not believe him. After all, the demon ancestor did not know much about the Heavenly Dao.

"Whether it's the Heavenly Dao or the Great Dao does not matter. It doesn't matter if it's the nine zones or the Divine World. Both are just names. What hasn't changed is that it's our homeland," the immortal ancestor said, "Since you are a divine being of the Heavenly Dao, you should be able to let us return to our homeland without being rejected, right?"

An Ancient Chaos God spoke from behind a ring of light, "This world was created by the chaos. We Ancient Chaos Gods are the first living creatures of the chaos and the first to enter this world. We belong here and should be allowed to enter it."

The Ancient Chaos Gods all agreed with him. The immortal ancestor's words were meant to exclude them, which could not be allowed.

Monster Ancestor (Part 1)