Image:Coin.gif A Signal Whistle is a unique non-stacking item found only in the possession of Briggs and made use of in the Briggs boss fight early in Golden Sun: The Lost Age. Whereas most bosses' unique abilities manifest in the form of unique actions such as casting unique Psynergy and using monster skills, such as Star Magician's Mystic Call to summon additional enemies to join the battle, Briggs instead carries three of these items and uses them throughout his boss fight. In normal play, when Briggs uses a Signal Whistle, a whistling sound is heard, an array of blue music notes sprays out of him, and then a new Sea Fighter unit appears on his side of the battlefield, ready to battle from the next turn onward.