The Billion HP Outcast

Exiled for a useless power, he changed one word and became unkillable.

On awakening day, D-rank ability user Leon is tested with “double HP” and publicly expelled by the Shaw family. At his lowest, a strange system lets him change one word in his ability's description. He changes “double” to “billion”: ten billion HP, immune to every one-hit kill. After a blood oath cutting ties with his family, he walks alone into Villain Valley and discovers among mutant beasts that he is the real monster. He forms an immortal squad, clears a deadly secret realm, reaches the 99th floor of the Sky Tower and claims an ancient legacy. When an alliance comes for him with holy swords and forbidden arts, he crushes five hundred elites with one punch, then turns the valley into a home for everyone the world has abandoned.