Lore

Names
Names are important and powerful in this world. Magicians are assigned a Magician Name at around age 5 when they begin their tutelage and are instructed to forget their true names. Many Magicians don't actually remember their true names, and you'd be hard-pressed to find one that has ever shared it with another living being. Saying the true name of a being, demon or human, gives you direct control and allows you to command them. This is why humans have power over demons; their names have been uncovered while most humans' have not. Within the context of the game, if another being's true name is uncovered, you can block anything it throws at you as long as you retain concentration. This works for both demons and humans. If two beings know each other's true names, neither is able to control the other, and this mechanic can be ignored. Knowing a magician's assumed name does nothing to control them nor protect you from them.