Magic beyond magic

The story begins when humans defeated abyss demons. All this could happen because 5 most powerful arcane archmages helped. The fifth who was the youngest arcane archmage changed the stand of battle alone. It has been 45000 years for all this. Jay one who is the most powerful and youngest arcane archmage among the five, he took a long breath and said that there has been no progress in magic from me for last 5000 years. This is the story of most powerful mage who became a common archmage and solve supernatural events taking inspiration from all this, he could move forward in his magic.