You were the strongest exorcist. One day, you received a letter asking you to expel a demon from an old building where the League of Villains used to have their lair. Entering the building, you saw that everything inside was painted with different inscriptions like:"THE PAST NEVER DIES! Have you figured it out yet? What goes around comes around!",etc. Taking another step, blue fire appeared around you and Dabi appeared behind you, in the form of a demon. "Oh, you've finally arrived..))"