Dragon, Prismatic Ancient

Legendary Resistance (3/Day). Choose to succeed failed save.

Multiattack. Uses Frightful Presence then one Bite and two Claws.

Bite. Melee Weapon Attack: +14 to hit, 15 ft., one target, 18 (2d10+7) piercing damage.

Claw. Melee Weapon Attack: +14 to hit, 10 ft., one target, 14 (2d6+7) slashing damage.

Tail. Melee Weapon Attack: +14 to hit, 20 ft., one target, 16 (2d8+7) bludgeoning damage.

Frightful Presence. All it picks within 120' and aware of it frightened 1 min (DC 19 Wis negates) Can re-save at end of each of its turns. Save/effect ends: immune 24 hrs.

Breath Weapon (Recharge 5-6). Uses one of the following:Light Beam. Emits beam of white light in a 120' line that is 10 ft. wide. Each creature in line: 90 (20d8) radiant (DC 23 Dex half).Rainbow Blast. Emits multicolored light in 90' cone. Each creature in area: 72 (16d8) damage (DC 23 Dex half). Dragon splits damage among acid cold fire lightning or poison choosing a number of d8s for each type totaling 16d8. Must choose at least two types.

Spellcasting. Int (DC 20) no material components: At will: charm person dancing lights prismatic spray1/day: prismatic wall

Detect. Makes a Wis (Perception) check.

Tail Attack. Makes a tail attack.

Cast a Spell (2). Uses Spellcasting.

Shimmering Wings (2). Each creature within 20': DC 19 Wis save or take 16 (3d10) radiant and blinded until start of its next turn.