My Tower of Creation

Arthur was once an ordinary student. But his world wasn't ordinary. The wizards and humans were constantly fighting against each other. And he powerlessly died. After his death, he reincarnated in a new world. And soon he changed his fate and became the first immortal of this world. Becoming the first immortal was both blessing and a curse for him. He wasn't afraid of death anymore but as decades past he witness the approaching death of the planet. Arthur decided to save this planet to protect the people who are like his old self. And he built his own tower of creation.