A ruined dantian? No such thing.
When Su Xuan was sixteen, everyone told him, "Your dantian is shattered. You'll never be able to cultivate."
Then he fell off a cliff.
His dantian wasn't shattered. No one had ever told him that it wasn't a dantian at all, but the seed of a universe.
Other people's dantians are vessels that hold spiritual energy. His dantian is a universe that holds all things.
Spirit stones? Devoured. Pills? Devoured. Treasures? Devoured. Enemy attacks? Devoured too.
Everything can be devoured, and all things can be consumed to evolve the universe.
When the first star lit up, he punched the strongest prodigy in town into oblivion.
When the tenth star lit up, he single-handedly held back an army of three thousand demonic cultivators.
When the hundredth star lit up, he stood above the Nine Heavens, looking down upon all races.
The master of the Nine Heavens Divine Palace asked him, "Who are you, exactly?"
Su Xuan replied:
"There's an entire universe in my dantian. Can you beat the universe?"