Once players have made a decent amount of progress through Tartarus in Persona 3 Reload, they'll be called into a meeting with Ikutsuki, who will introduce the SEES members to a brand-new technique called Theurgy. While he doesn't explain exactly how it works at first, it's soon revealed that these powerful abilities can be used when a character's emotions reach a boiling point, and they ultimately serve as a last resort when a battle starts getting a little dangerous.