Ancient God

An ancient battle was so shocking that the sky was broken into six parts. Countless years later, a generation of young boy Xuantian was born in the lowest level of heaven and earth holding weapon fragments. He was born with a disability, suffered from headaches, and had a very weird brain. Finally one day, the abnormality in my mind became clear. It turned out to be memory fragments, recording a corner of ancient times. Oh my God! It turned out to be a scene of fighting on an ancient battlefield. All races were stained with blood, and beasts roared. It was earth-shattering. Who am I? Why is there a lack of memory?