I Live in the Cracks of the World of Cultivating Immortals

Traveling through the world of immortality, the immortal cuts off mountains and rivers with one sword. Su Chi Ling is useless and unable to practice, but he possesses a golden finger that is against the heavens - "transform an immortal into a mortal": no matter how strong an immortal cultivator is, as long as he touches it, he will instantly kill him. The problem is... I can't touch it at all. In order to take revenge, he could only wait for an opportunity in the cracks and kill all the enemies in front of him one by one. Grandpa, rebirth, simulator, proficiency system... Wait a minute - there seem to be too many idiots in the world of immortality?