In the Apocalypse, I Can Transform into a Space Knight

After ten years of Nirvana, the end of the world has arrived. Human beings have become the prey of mutant beasts. Only mutants can transform into skeleton warriors and protect the last refuge. Lin Yue is an ordinary time traveler. A refugee who couldn't even pay the entrance fee spent every day picking up rags in the ruins and waiting to die. That day he saw a month-long white crystal skeleton - four crystal wings and a crystal gun, slaughtering the herd and then flying away without looking back. The way he looked at him was like looking at trash. But when those few broken crystal core fragments melted into his palm. [Tiejaman System·Awakening] Three months ago he was still a social animal in 996, and three months later he became the only "evolver" in the apocalypse. Others are finalized when they awaken, but he is the only one who can kill monsters, absorb cores, and evolve infinitely.