Adult Sapphire Dragon

Huge dragon (gem), Lawful Neutral

Armor Class18 (natural armor)
Hit Points225 (18d12 + 108)
Speed40 ft., burrow 30 ft., climb 40 ft., fly 80 ft.
STRDEXCONINTWISCHA
23 (+6) 14 (+2) 22 (+6) 18 (+4) 17 (+3) 18 (+4)
Saving ThrowsCha +9, Con +11, Dex +7, Wis +8
SkillsHistory +9, Perception +13, Persuasion +14, Stealth +7
Damage Vulnerabilities—
Damage Resistanceslightning; thunder
Damage Immunities—
Condition Immunitiesfrightened
Sensesblindsight 60 ft., darkvision 120 ft., passive Perception 23
LanguagesCommon, Draconic, telepathy 120 ft.
Challenge15

Traits

Legendary Resistance (3/Day).

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

Spider Climb.

The dragon can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.

Tunneler.

The dragon can burrow through solid rock at half its burrowing speed and can leave a 10-foot-diameter tunnel in its wake.

Actions

Multiattack.

The dragon makes one Bite attack and two Claw attacks.

Bite.

Melee Attack Roll: +11 to hit, reach 10 ft., one target. Hit: 17 (2d10 + 6) piercing damage plus 5 (1d10) thunder damage.

Claw.

Melee Attack Roll: +11 to hit, reach 5 ft., one target. Hit: 10 (1d8 + 6) slashing damage.

Debilitating Breath (Recharge 5-6).

The dragon exhales a pulse of high-pitched, nearly inaudible sound in a 60-foot cone. Each creature in that area must make a DC 19 Constitution saving throw. On a failed save, the creature takes 44 (8d10) thunder damage and is incapacitated until the end of its next turn. On a successful save, the creature takes half as much damage and isn't incapacitated.

Legendary Actions

Claw.

The dragon makes one Claw attack.

Psionics (Costs 2 Actions).

The dragon uses Psychic Step or Spellcasting.

Telekinetic Fling (Costs 3 Actions).

The dragon chooses one Small or smaller object that isn't being worn or carried that it can see within 60 feet of it, and it magically hurls the object at a creature it can see within 60 feet of the object. The target must succeed on a DC 17 Dexterity saving throw or take 31 (9d6) bludgeoning damage.

Spellcasting (Psionics)

The dragon casts one of the following spells, requiring no spell components and using Intelligence as the spellcasting ability (spell save DC 17):

1 each/day: dissonant whispers, hold monster, meld into stone, telekinesis