Others Scramble to Survive the Apocalypse, While You Fly on a Sword. How Is That Reasonable?

In his previous life, Zhang Yuan was guilt-tripped by his manipulative girlfriend and died horribly in a demon’s jaws while trying to save a cat! Reborn on the day the apocalypse began, Zhang Yuan immediately sacrificed his self-righteous, manipulative girlfriend and activated the System! 【A strong will to survive has been detected in the Host. Binding conditions met. Apocalypse Survival System activated.】 【The System is mutating... System mutation successful... Cultivation Assistance System successfully bound to Host.】 A cultivation System in an apocalyptic world? How could that not be awesome? When a group of S-rank ability users surrounded Zhang Yuan, all the survivors thought he was done for. But Zhang Yuan snapped his fingers, and a grand formation rose, flying swords hung in the air, and pillfire blazed across the heavens... All the ability users went mad. “Those are abilities? That’s freaking immortal magic!”