Beginning of the Spell

How did mages cast spells before spells were fully developed? There are no spells or magic circles, real magic is born in the mysterious core of people's brains I think magic, like science, is full of curiosity and awe of the world. Based on this, I want to work hard to show the true charm of magic combat. A completely innovative world, the continent of Zangenaya, a human country called the Altureia Federation, a scam buried in history This is a story about those who will change the world before the golden age of magic. In the 144th year of God's decree, blood rain fell from the sky