I Forge My Dead Legion

When the doomsday breaks, Kai is betrayed and left dying by his girlfriend Lena. He awakens the All-Craft System and gains immortal bloodline. He synthesizes a zombie army and avenges the Blackwater Gang with his powerful allies. Facing S-rank and SS-rank apocalyptic disasters, Kai fuses with the world’s will, defeats the world devourer, and ends the doomsday. He then walks alone, chasing the final truth.