Multiattack

Uses Musical Arrangement. Then two Hammer Note or Pulsating Cacophony attacks.

Hammer Note

Melee Weapon Attack: +9 to hit 5 ft. 1 tgt in the swarm's space. 36 (8d8) bludgeoning damage or 18 (4d8) bludgeoning damage if symphony has half its hp or fewer.

Pulsating Cacophony

Ranged Spell Attack: +11 to hit, 60 ft., one target, 22 (4d10) thunder + 13 (2d12) psychic or 11 (2d10) thunder + 6 (1d12) psychic if the symphony has half its hp or fewer.