Diapason

Diapason is a Harmonix offensive spell used by Musa. She summons a purple/dark pink diapason and can play the it like a harp or tap it with her index finger to release visible, pale lavender sound waves at the enemy or object.

Series

 * Season 5 Episode 7 - Used against the mutants.
 * Season 5 Episode 11 - Used against Darcy.
 * Season 5 Episode 13 - Used against the Oil Monster.

Comics

 * Issue 106 - Used to neutralize the birds' cries but failed.

Trivia

 * A diapason is a tuning fork.
 * In Issue 106 of the Winx Club Comic Series, this spell appears just like most of Musa's sound-based attacks.