Review Detail of GifflarGod in BlackMage

I just started reading this but you must write another chapter to better explain the levels of mages and the ways mages use their powers.. there is no explanation to many things and also world background should be explained. there was too much of a skip after he came back in time and the fight against that princess. for example.. he pulled out his spear out of nothing in the fight against her.. was that speat a magic itself? can you use any kindd of magic with your own element? Also the way you made all his abilities stay was kinda stupid.. you could've just brought him back and make him train again to become strong with all his experience.. and his body didn't back to how it was when he was in his teens? you just basically teleported him to back in time and threw that version of himself out of reality.. makes no sense