Legendary Resistance (3/Day). If Nintra fails a saving throw, she can choose to succeed instead.
Spellcasting. Nintra casts one of the following spells, using Charisma as the spellcasting ability (save DC 20) and requiring no material components:
3/day each: dispel magic, faerie fire, mirror image
Multiattack. Nintra makes two attacks.
Claw. Melee Weapon Attack: +12 to hit, reach 5 ft., one target. Hit:12 (2d4 + 7) piercing damage.
Shard of Shadow. Ranged Spell Attack: +12 to hit, range 120 ft., one target. Hit:10 (1d6 + 7) necrotic damage, and if the target is a creature, it must succeed on a DC 20 Constitution saving throw or be poisoned until the end of its next turn.
Storm of Shattered Glass (Recharge). Nintra targets a point she can see within 60 feet of her and creates a 20-foot-radius sphere of swirling glass shards centered on that point. Each creature in the sphere must make a DC 20 Dexterity saving throw, taking 28 (8d6) slashing damage on a failed save, or half as much damage on a successful save. If Nintra is in the sphere, the shards deal no damage to her.
Attack. Nintra makes one attack.
Fey Step. Nintra teleports to an unoccupied space she can see within 30 feet of her.
Shadow Strikes (Costs 2 Actions). Provided she is in bright or dim light, Nintra causes her shadow to attack a creature within 10 feet of her. Her shadow makes two claw attacks, each attack identical to Nintra's claw attack except that it deals psychic damage instead of piercing damage.
Nintra Siotta, a chaotic evil archfey who was exiled from the Gloaming Court by the Queen of Air and Darkness long ago, is known in Faerûn by three titles: Princess of the Shadow Glass, Lady of Dread Omens, and Seeker of the Three Crowns. She appears as a 9-foot-tall humanoid made of smoky gray glass, wrapped in a cloak-like darkness that appears to devour the light.