Legendary Resistance (4/Day). If the dragon fails a saving throw, it can choose to succeed instead.
Siege Monster. The dragon deals double damage to objects and structures.
Unusual Nature. The dragon doesn’t require air or sleep.
Multiattack. The dragon makes one Bite attack, two Claw attacks, and one Tentacle attack.
Bite. Melee Weapon Attack: +15 to hit, reach 15 ft., one target. Hit: 19 (2d10 + 8) piercing damage plus 11 (2d10) psychic damage.
Claw. Melee Weapon Attack: +15 to hit, reach 10 ft., one target. Hit: 11 (1d6 + 8) slashing damage.
Tentacle. Melee Weapon Attack: 8 to hit, reach 10 ft., one target. Hit: 10 (1d8 + 8) bludgeoning damage, and the target is grappled (escape DC 18). The dragon can have up to four targets grappled at a time.
Tadpole Brine Breath (Recharge 5–6). The dragon exhales brine in a 120-foot line that is 15 feet wide. Each creature in that area must make a DC 22 Constitution saving throw, taking 55 (10d10) psychic damage on a failed save, or half as much damage on a successful one. On a success or failure, if the creature isn’t a Construct or an Undead, it becomes infested with illithid tadpoles.
While infested, the creature takes 16 (3d10) psychic damage at the start of each of its turns. The creature can repeat the saving throw at the end of each of its turns, ending the effect on itself after it succeeds on three of these saves. If the creature is targeted by magic that ends a curse or restores 40 hit points or more, the tadpoles infesting the creature are killed instantly, ending the effect on the creature.
If a Humanoid is reduced to 0 hit points while infested, the creature is stable but remains unconscious for 6d12 hours. When the period of unconsciousness ends, the creature transforms into a mind flayer (see the Monster Manual) with all its hit points. Casting a wish spell on the unconscious creature rids it of the infestation and prevents it from turning into a mind flayer.
Spellcasting (Psionics). The dragon casts one of the following spells, requiring no spell components and using Intelligence as the spellcasting ability (spell save DC 23, +15 to hit with spell attacks):
1/day each: blink, control water, dispel magic, freedom of movement, globe of invulnerability, plane shift, protection from evil and good, sending
Psychic Step. The dragon magically teleports to an unoccupied space it can see within 60 feet of it.
The dragon can take 3 legendary actions, choosing from the options below. Only one legendary action 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.
Tentacle. The dragon makes one Tentacle attack.
Shatter Concentration (Costs 2 Actions). The dragon targets a creature it is grappling. The target’s concentration on a spell it has cast or an ability it is maintaining ends, and the target takes 19 (3d12) psychic damage.
Psionics (Costs 2 Actions). The dragon uses Psychic Step or Spellcasting.
Explosive Crystal (Costs 3 Actions). The dragon spits an amethyst that that explodes at a point it can see within 60 feet of it. Each creature within a 20-foot-radius sphere centered on that point must succeed on a DC 23 Dexterity saving throw or take 18 (4d8) force damage and be knocked prone.
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