The Guard Is Actually An Archmage

To save his sister, fixer Milo fakes a mage license for a night guard job, absorbing Calamity powers by fixing broken exhibits. In the Trial, he defeats foes using grandpa's tools to repair, not kill. When dark mage Valerian strikes, Milo's bloodline awakens. He crushes the plot with God's Anchor, rising as the new Archmage.