They Seek Immortality. I Grind EXP

Shen Jin can't cultivate. His spirit roots are garbage. Three months till he gets kicked out of the sect. Then a system panel pops up. He picks Warlock. Now he's got a demon patron who's been dead for thirty thousand years, a tang dao that drinks blood and talks in temperature, and one rule: the more he bleeds, the harder he hits. The cultivators call him a madman. He calls them EXP.