Quenth, the Mirror Tyrant

Traits

• Magic Resistance. The creature has advantage on saving throws against spells and other magical effects.
• Legendary Resistance (3/Day). If the creature fails a saving throw, it can choose to succeed instead.
• Hall of Reflections. Quenth is never truly where it appears. Whenever it is targeted by an attack while within 30 feet of a reflective surface (a mirror, still water, polished glass), it can choose to be hit instead in the body of one of its mirror-images; the attack deals no damage and the image shatters. Quenth maintains up to three such images and can re-form a shattered one at the start of its turn.

Actions

• Shard Lash. Melee Weapon Attack: +11 to hit, reach 10 ft., one target. Hit: 20 (3d8 + 7) force damage. Reach 10 ft. A whip of jagged mirror-glass. On a hit, the target's reflection is briefly stolen: it can't see itself in any reflective surface until the end of its next turn and has disadvantage on the next attack roll it makes before then.
• Mind Splinter. Ranged Weapon Attack: +12 to hit, range 120 ft., one target. Hit: 18 (4d8) psychic damage. Range 120 ft., one creature. The target sees a perfect duplicate of itself lunge from the air. On a hit it must succeed on a DC 19 Wisdom saving throw or be unable to take reactions until the start of its next turn.

Bonus Actions

• Step Through Glass. Quenth vanishes into one reflective surface within 5 feet of it and reappears in an unoccupied space within 5 feet of another reflective surface it can see within 60 feet. It can make one Shard Lash attack immediately before or after this move.

Reactions

• Returned Blow. When a creature Quenth can see within 60 feet hits it with an attack, Quenth can answer with its own reflection: the attacker must succeed on a DC 19 Charisma saving throw or take 18 (4d8) psychic damage as its strike rebounds through the mirror-world.

Legendary Actions

Quenth, the Mirror Tyrant can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time, and only at the end of another creature's turn. Quenth regains spent legendary actions at the start of their turn.

• Detect. The creature makes a Wisdom (Perception) check.
• Mind Blast (Costs 2 Actions). The creature emits psychic energy in a 60-foot cone. Each creature in that area must succeed on an Intelligence saving throw or take psychic damage and be stunned until the end of its next turn. Each creature in the area must make a DC 20 Intelligence saving throw, taking 4d8+{intMod} psychic damage on a failed save, or half as much damage on a successful one.
• Psychic Crush (Costs 2 Actions). Ranged Weapon Attack: +12 to hit, range 60 ft., one target. Hit: 27 (5d10) psychic damage, and the target must succeed on a DC 20 Intelligence saving throw, taking half as much damage on a success. The creature targets one creature it can see within 60 feet. The target must make an Intelligence saving throw, taking psychic damage on a failed save, or half as much on a successful one.