Blacksmith: The Tempering Begins With One's Flesh TTBWOF

Lin Feng had transmigrated to another world. Since he did not have any talent, he was relegated to being a blacksmith for his entire life. When he was old, frail, and on the verge of death, the system finally kicked into action.
He decided that refining his own body was better than refining weapons for others. This time, he was jumping into the fray himself, determined to refine himself into a true peerless divine weapon.
Flesh Tempering: Hundred Refined Body, Adamantine Armor, Magma Body, Indestructible Body
Forging Marrow: Refined Steel Bone, Gilded Gold Marrow, Divine King's Bones, Burning Sky Tyrant Bone
Forging Blood: Blazing Fire Blood, Lava Blood, God King's Blood, Heavenly Dao Blood.
Forging Heart: Heart of Fire, Heart of Magma, Crimson Sun Furnace, Heart of Eternal Life