I Use the Ashes to Refine Immortality

Shen Yan, a medicine slave in the border mining town, was born with "mortal bones" and undetectable spiritual roots. He was regarded by the Qinglu Sect as the "furnace sacrificer" to extend the life of the young sect leader. The beginning is not to break off the engagement, not to pick up the old man, but to be pushed into the human refining furnace alive. When the furnace fire reached the bone marrow, he discovered that he was not without talent, but had a sealed "Ember Sky Bone" hidden in his body. This bone does not absorb ordinary spiritual energy, but only eats "dying fire": furnace ashes, residual pills, defeated fire, corpse flames, embers of heavenly tribulation, and immortal fire. The gold finger he got was not a free plug-in, but a small black iron stove left by his mother, named "Tianqi Stove". It can refine medicine, weapons, and soul traces, and it can also record the "price" of all things. Every time you practice, you have to repay a debt. Debts can be repaid with spiritual stones, longevity, the lives of enemies, and unfinished karma.