The Putrid Vein

This is a decaying world where spiritual energy has been exhausted. Above the sky, there is no clear weather, only a layer of gray-brown 'corrupt clouds'—formed by the miasma released from the rotting of dead cultivators, gods, and beasts during an ancient war. The creatures on the ground barely survive on the remaining thin spiritual energy, but those with true power have already turned to another path of cultivation—absorbing 'corrupt qi.' This world has no thriving cultivation golden age, only a twilight-like sense of withering: towns sell preservative herbs in medicine shops, markets trade in 'unrotten items,' and the strong compete not for blessed caves and heavenly realms, but for 'corrupt lands' that are still in the process of rotting. This is a land slowly dying, where 'return' is its underlying law. — Description from novelcodex.org