Crescendo

Unknown level, Unknown school

• Casting time: Legendary action
• Range: 30 feet
• Components: Unknown
• Duration: Instantaneous

Every creature within 30 feet that has at least one Melody Mark makes a DC 17 Wisdom saving throw. On a failed save, it gains 1 Melody Mark.

Sources

Homebrew. An ability of The Piper, from the fight in 14-The Piper.