Ashes of the Last Firebird

After civilization collapses, Ethan discovers a legendary flame spirit within him while searching for a cure for his infected sister. Jealous Mack brands him a useless low tier, forcing Ethan to hide his strength. As monstrous swarms close in, he risks everything to protect survivors, faces four terrifying beast rulers alone, and rises from the ruins to claim justice, safety, and a new home for his sister.