Story. Beat Siren at the top of Siren's Tower and she joins you.
Signature move
Lunatic Voice: Wind magic, 7 hits on all enemies, with a chance of Sleep and Silence for 2 turns
Other moves
Attack · Water · Watera · Aero · Aerora · Aeroga · Bio (one or all enemies, Poison) · Slap (Charm) · Allure (Charm on all enemies) · Sonic Buffet · Tornado (all enemies, Deprotect and Deshell)