Multiattack. The dragon makes one Bite attack and two Claw attacks.

Bite. Melee Weapon Attack: +9 to hit, reach 10 ft., one target. Hit: 16 (2d10 + 5) piercing damage plus 4 (1d8) radiant damage.

Claw. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 9 (1d8 + 5) slashing damage.

Scintillating Breath (Recharge 5–6). The dragon exhales a burst of brilliant radiance in a 60-foot cone. Each creature in that area must make a DC 17 Constitution saving throw, taking 40 (9d8) radiant damage on a failed save, or half as much damage on a successful one. The dragon then gains 15 temporary hit points by absorbing a portion of the radiant energy.

Spellcasting (Psionics). The dragon casts one of the following spells, requiring no spell components and using Intelligence as the spellcasting ability (spell save DC 16):

At will: dancing lights, guidance

1/day each: command, divination, hypnotic pattern, lesser restoration

Change Shape. The dragon magically transforms into any creature that is Medium or Small, while retaining its game statistics (other than its size). This transformation ends if the dragon is reduced to 0 hit points or uses a bonus action to end it.

Psychic Step. The dragon magically teleports to an unoccupied space it can see within 60 feet of it.

The dragon can take a number of legendary actions equal to the number of players. At the end of a player’s turn that player can choose to have the dragon use one of its legendary actions choosing from the options below, only one legendary action option can be used at a time. The dragon regains spent legendary actions at the start of its turn.

Bite. The dragon makes one Bite attack.

Claw. The dragon makes one Claw attack.

Psionics. The dragon uses Psychic Step or Spellcasting.