Jiangshi: The Heaven-Severing Taoist of Uncle Jiu's World

A sixty-year-old man from modern times arrives in an age when the Dao is in decline, obsessed with attaining immortality and willing to pay any price. But he discovers that Ninth Uncle is everywhere. The more he thinks about this world, the more terrifying it seems. Every Ninth Uncle is righteous, but each treats the protagonist differently, and the protagonist responds to them in different ways as well.

Gu techniques, ghost-binding arts, Maoshan magic, artifact forging, worshipping gods, internal and external alchemy. The protagonist often changes his appearance after getting rid of the trouble he brought along when he transmigrated, so he may go by different aliases. Please go easy on him in the comments.