It's Liaozhai, not Cthulhu
Traveling to the world invaded by the old days, Qin Yuelou could only rely on an achievement system, but what he had to face was the demon gods of this world, the fallen gods and immortals.
Painting skin demon, water reckless resentment, law corpse, demon god cub... Bi Angji, Lin silkworm, Xia Xuan demon insect...
"If you get the true immortal position of the Dao Ancestor, why don't you worship Sanqing?" When Qin Yuelou finished ridiculing, the doors of the main avenues turned him away.
He also didn't like Buddhism because he didn't drink wine and eat meat. Since you can't attain the Fa-rectification, let's take a wild path to find a broad road.
Research demons and inhuman things to build battle bodies; Absorb knowledge, study the principles of spells, ......
"If the Heavenly Dao does not act, then change the Heavenly Dao." Qin Yuelou said,
"Knowledge is power." When Qin Yuelou looked back, he found that he was still in the rolling wave.
To put it simply, this is a story of rebellion against the invasion of the old days, rebellion against the fallen gods and Buddhas, and rebellion against the mandate of heaven.