Fusion Spells, Fusion Skills, or Mix Raids are skills that combine two or more skills, or the powers of two or more specific demons or Persona, to create a different effect that is usually a much more potent form of the spells being invoked. The Digital Devil Saga: Avatar Tuner series features Combos, which effectively work the same way. Combos can be used by combining different spell effects, or by combining a protective spell with the gun used by a character in human form.