F-Rank Flames? I Grow Stronger by Burning Everything and Bring the Era to an End

(Passionate + Thoughtful + Decisive and Ruthless + Plot-Focused) Spiritual qi revived, the wasteland invaded the human world, and magical beasts attacked human settlements. Humanity struggled to survive. The human world was divided in two. Those in the outer cities lived in shadowy corners, constantly fearing attacks by magical beasts and infection by wasteland corpses. Lu Ran awakened an F-rank flame and unexpectedly discovered that burning corpses with it gave him one percent of the Host's spiritual qi from when they were alive, while also increasing his flame's power. Not strong enough? “Burn corpses and your strength will rise rapidly!” Not talented enough? “My talent went straight from F-rank to SSS-rank!” No cultivation techniques? “I have cultivation techniques and martial skills above the Heaven rank. How can you possibly compete with me?” From now on, if there is no light, I, Lu Ran, will be the one and only flame.