Tempest is Gladiolus's default Technique that can be invoked when he is AI-controlled. It unleashes a pair of sweeping area attacks with a greatsword. Its critical version adds a third swing. Tempest can be followed up with an attack from Noctis.
Tempest is one of the eight skills of The Clever's Sigil: Spectral Arms. It can be used when selecting Greatsword. Tempest can damage several enemies around the user.