Apocalypse: Starting with Sword Immortal System

After a brush with death awakens his legendary sword powers, he races south to save his poisoned sister. Along the way, he rallies fierce allies to his side, storming enemy lines to retrieve her. But as an army of demon and undead lords lays siege to the city, he ascends to a new realm, repelling the horde with a single strike. He may have formed his legendary vanguard, but an ancient abyssal force has already marked him for death. Can he survive the impending darkness?