Legendary Resistance (3/Day). If the dragon fails a saving throw, it can choose to succeed instead.
Multiattack. The dragon can use its Frightful Presence. It then makes three attacks: one with its bite and two with its claws.
Bite. Melee Weapon Attack: +14 to hit, reach 10 ft., one target. Hit: 19 (2d10 + 8) piercing damage plus 7 (2d6) fire damage.
Claw. Melee Weapon Attack: +14 to hit, reach 5 ft., one target. Hit: 15 (2d6 + 8) slashing damage.
Tail. Melee Weapon Attack: +14 to hit, reach 15 ft., one target. Hit: 17 (2d8 + 8) bludgeoning damage.
Mind Control. Each creature of the dragon's choice that is within 120 feet of the dragon and aware of it must succeed on a DC 19 Wisdom saving throw or become charmed for 1 minute. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. If a creature's saving throw is successful or the effect ends for it, the creature is immune to the dragon's Mind Control for the next 6 hours.
Force Beam (Recharge 5–6). The dragon fires a beam similar to a beholder's desintigration beam in a straight 5-foot wide 240-foot long line. Each creature in that area must make a DC 21 Dexterity saving throw, taking 81 (18d8 force damage on a failed save, or half as much damage on a successful one.
Psychic DIsruption (Recharge 5–6). The dragon sends off a wave of psychic energy in a 60-foot cone. Each creature in that area must make a DC 19 Wisdom saving throw, taking 49 (14d6) psychic damage on a failed save, or half as much damage on a successful one.
The dragon 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. The dragon regains spent legendary actions at the start of its turn.
Detect. The dragon makes a Wisdom (Perception) check.
Tail Attack. The dragon makes a tail attack.
Wing Attack (Costs 2 Actions). The dragon beats its wings. Each creature within 10 feet of the dragon must succeed on a DC 22 Dexterity saving throw or take 15 (2d6 + 8) bludgeoning damage and be knocked prone. The dragon can then fly up to half its flying speed.
Description
The long body of a purple dragon is slender, agile and particularly catlike and serpentine. their snakelike bodies, swept-back wing structure, thin limbs and sleek, tapered head allow them to worm their way through narrow subterranean tunnels in the underdark.