Abandoned by the Immortal Sect from the Start, I Slay Demons and Become an Immortal in the Mortal Realm

[Decisive and ruthless + satisfying story + slow burn + no fake saint + slaying demons and evil spirits] Lin Tian transmigrated and spent three years as a menial disciple at the Tianxuan Sect. After a test revealed he had no aptitude for cultivating immortality, they mercilessly expelled him from the sect and stripped him of his status as a cultivator. With his path to immortality cut off and his prospects bleak, all he could do was open a clinic in a city of mortals and live out an uneventful life. Then one day, the son of the town's richest man came seeking treatment for a strange illness. Lin Tian saw at a glance that an evil spirit had possessed him! He had planned to keep his head down and stay out of trouble, but golden light suddenly blazed in his mind, activating the Book of Merit! Slay demons, vanquish evil, save the sick and heal the wounded, and all of it becomes supreme merit! [Treat a patient possessed by an evil spirit. Reward: 1 merit point!] [Slay a century-old mountain spirit's incarnation. Reward: 20 merit points!] [Destroy a ten-thousand-foot demon lord who has lived for a millennium. Reward: 100,000 merit points!] With merit points in hand, anything in the world can be exchanged for! One merit point buys an extra year of life; ten merit points grant perfect recall! A hundred merit points can be exchanged for an acquired spiritual root, letting him return to the path of immortality! When the sect's once-proud prodigies are hunted by a great demon and flee into Qingyang City in utter disarray, what they see is the good-for-nothing disciple they once mocked. Lin Tian holds a butcher's knife and cleaves apart the demon clouds filling the sky! “A doctor's heart is a parent's heart. Sending demons and monsters to their deaths is just another way of saving lives!”