This Casual Cultivator Upgrades a Bit Quickly

Reborn in the chaotic world of immortals and demons, Wang Li started by destroying his spiritual roots. He was destined to miss the chance to build a foundation in this life. Fortunately, you can obtain demonic elements by killing demons, and by consuming demonic elements, you can infinitely improve your realm. From now on, there will be no bottlenecks in cultivation or breakthrough difficulties. However, upgrading too quickly is not without its drawbacks. The feeling of emptiness that gnaws at your heart every time you finish something. If you don't upgrade, you won't understand...