Amazing, the author is a genius at making mana realistic as well as showing how history as effected its advancement. The types of powers in the book are also incredibly diverse. From genetic based to skill based, you never know if the opponent has a overpowered ability or can juice a basic spell with a million times the maximum or even creating things that break away from the science of magic and deletes into creativity like black flame or shadow flames, how shadows can infect darkness. That's just he world building lol.