Ancient Amethyst Dragon

Gargantuan dragon (gem), typically neutral

Armor Class

20 (natural armor)

Hit Points

444 (24d20 + 192)

Speed

walk 40 ft., fly 80 ft. (hover), swim 40 ft.

Saves

Dex +9, Con +15, Wis +11, Cha +13

Skills

Arcana +22, Perception +18, Persuasion +13, Stealth +9

Damage Resistances

force, psychic

Condition Immunities

frightened, prone

Senses

blindsight 60 ft., darkvision 120 ft.

Languages

Common, Draconic, Telepathy 120 ft.

Challenge

23

Proficiency Bonus

+7

Amphibious

The dragon can breathe both air and water.

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: +15 to hit, reach 15 ft., one target. Hit: 19 (2d10+8) piercing damage plus 13 (3d8) force damage.

Claw

Melee Weapon Attack: +15 to hit, reach 10 ft., one target. Hit: 15 (2d6+8) slashing damage.

Singularity Breath (Recharge 5-6)

The dragon creates a shining bead of gravitational force in its mouth, then releases the energy in a 90-foot cone. Each creature in that area must make a DC 23 Strength saving throw. On a failed save, the creature takes 63 (14d8) force damage, and its speed becomes 0 until the start of the dragon's next turn. On a successful save, the creature takes half as much damage, and its speed isn't reduced.

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

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.

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.