Ancient Crystal Dragon

Gargantuan dragon (gem), typically chaotic neutral

Armor Class

20 (natural armor)

Hit Points

222 (12d20 + 96)

Speed

walk 40 ft., burrow 40 ft., climb 40 ft., fly 80 ft.

Saves

Dex +7, Con +14, Wis +9, Cha +11

Skills

Perception +15, Stealth +13, Survival +9

Damage Resistances

cold, radiant

Condition Immunities

frightened, prone

Senses

blindsight 60 ft., darkvision 120 ft.

Languages

Common, Draconic, Telepathy 120 ft.

Challenge

19

Proficiency Bonus

+6

Legendary Resistance (3/Day)

If the dragon fails a saving throw, it can choose to succeed instead.

Actions

Multiattack

The dragon makes one Bite attack and two Claw attacks.

Bite

Melee Weapon Attack: +13 to hit, reach 15 ft., one target. Hit: 18 (2d10 + 7) piercing damage plus 9 (2d8) radiant damage.

Claw

Melee Weapon Attack: +13 to hit, reach 10 ft., one target. Hit: 14 (2d6 + 7) slashing damage.

Scintillating Breath (Recharge 5-6)

The dragon exhales a burst of brilliant radiance in a 90-foot cone. Each creature in that area must make a DC 22 Constitution saving throw, taking 49 (11d8) radiant damage on a failed save, or half as much damage on a successful one. The dragon then gains 25 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 19): • At will: dancing lights, guidance • 1/Day each: command, divination, greater restoration, hypnotic pattern, invisibility

Change Shape (Bonus Action)

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 (Bonus Action)

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

Legendary actions

Legendary Actions (3/Turn)

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.

Claw

The dragon makes one claw attack.

Psionics (Costs 2 Actions)

The dragon uses Psychic Step or Spellcasting.

Starlight Strike (Costs 3 Actions)

The dragon releases a searing beam of starlight at a creature that it can see within 60 feet of it. The target must succeed on a DC 19 Dexterity saving throw or take 38 (11d6) radiant damage.