Multiattack

The moon nymph makes two beguiling touch attacks or two moonbeam attacks.

Beguiling Touch

Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 17 (4d6 + 3) psychic damage, and the target must succeed on a DC 14 Charisma saving throw or be stunned until the end of its next turn.

Moonbeam

Ranged Weapon Attack: +6 to hit, range 120 ft., one target. Hit: 21 (4d8 + 3) radiant damage, and the target is blinded until the end of its next turn.

Veil of Nightmares (1/Day)

The moon nymph emits a wave of hallucinatory nightmare visions. Each creature within 5 feet of the moon nymph must make a DC 14 Wisdom saving throw. On a failure, the creature takes 36 (8d8) psychic damage and is frightened. On a success, the creature takes half of the damage and isn't frightened. A frightened creature must succeed on a DC 10 Wisdom saving throw at the end of its turn to end the effect on itself. On a second failed save, the creature is incapacitated by fright for 1 round. On the start of its next turn, the creature must succeed on a DC 12 Wisdom saving throw or be reduced to 0 hp.