Ten thousand years of cultivation. One immortal returning to a world overrun by demons.Albus Knight expected chaos. He didn't expect to become humanity's only hope.One rescued girl. A dozen destroyed demon caves. A sister learning to harness powers she never knew she had. The allies keep coming.But behind the demon invasion lurks a darker force—Satan himself, with plans that stretch far beyond this world.The last immortal stood alone for millennia. Now he stands between humanity and extinction. And he's not backing down.