Tone of the Shephard

You create an auditory illusion that fills the air in a 15 foot radius around yourself. Each creature that can hear the tune must make a Wisdom saving throw. on a failure, any creature affected takes 1d10 psychic damage. At the beginning of affected creatures turns, they must re-roll the saving throw, taking an additional 1d10 damage on a failure or overcoming the effect on a success.

CREDIT: Stibbles Codex of Companions