Ancient Ruby Dragon

Gargantuan dragon, lawful neutral

Armor Class

23 (natural armor)

Hit Points

299 (26d20 + 26)

Speed

40 ft., fly 80 ft. (hover)

STR

23 (+6)

DEX

26 (+8)

CON

12 (+1)

INT

26 (+8)

WIS

18 (+4)

CHA

24 (+7)

Damage Immunities

fire, lightning

Damage Resistances

bludgeoning, slashing, and piercing from nonmagical attacks

Damage Vulnerabilities

psychic

Senses

blindsight 60 ft., darkvision 120 ft., passive Perception 28

Saving Throws

Dex +15, Int +15, Wis +11, Cha +14

Skills

Arcana +15, Insight +11, Perception +11, Religion +15

Languages

Common, Draconic, telepathy 120 ft.

Challenge

23 (50,000 XP)

Legendary Resistance (3/Day). If the dragon fails a saving throw, it can choose to succeed instead.

Amplification Aura. Allies’ spells cast within 30 feet have their saving throw DC increased by 4.

Psionics

Charges: 26

Recharge: 1d10

Fracture: 32

Actions

Multiattack. The dragon makes three attacks: one with its bite and two with its claws.

Bite. Melee Weapon Attack: +13 to hit, reach 15 ft., one target. Hit: 17 (2d10 + 6) piercing damage.

Claw. Melee Weapon Attack: +13 to hit, reach 10 ft., one target. Hit: 13 (2d6 + 6) slashing damage.

Tail. Melee Weapon Attack: +13 to hit; reach 20 ft., one target. Hit: 15 (2d8 + 6) bludgeoning damage.

Legendary Actions

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.

Detect. The dragon makes a Wisdom (Perception) Check.

Psionics. The dragon uses a psionic ability.

Psionic Shift (Costs 2 Actions). The dragon releases a wave of telekinetic energy from its mind. Every creature within 15 feet must make a DC 24 Intelligence saving throw or take 15 (2d6 + 8) force damage and be knocked prone. The dragon then can move up to half its movement speed.

Lair Actions

On initiative count 20 (losing initiative ties), the dragon takes a lair action to cause one of the following effects. The dragon can’t use the same effect two rounds in a row.

The dragon manifests amplify at no cost.
The dragon manifests the real at no cost. It does not require concentration and lasts for 10 minutes.
The dragon casts dispel magic. The spell automatically ends spells of 5th level or lower. For each spell of 6th level or higher on the target, make an ability check using the dragon’s Intelligence as its spellcasting ability. The DC equals 10 + the spell’s leveI. On a successful check, the spell ends.

Regional Effects

Intelligent creatures who sleep within 12 miles of a ruby dragon’s lair dream of people they know transforming into other people, of places they’ve been dissolving to reveal barren wastelands.