Gargantuan dragon (gem), Lawful Neutral
| Armor Class | 20 (natural armor) |
|---|---|
| Hit Points | 370 (20d20 + 160) |
| Speed | 40 ft., burrow 40 ft., climb 40 ft., fly 80 ft. |
| STR | DEX | CON | INT | WIS | CHA |
|---|---|---|---|---|---|
| 27 (+8) | 14 (+2) | 27 (+8) | 21 (+5) | 19 (+4) | 20 (+5) |
| Saving Throws | Cha +12, Con +15, Dex +9, Wis +11 |
|---|---|
| Skills | History +12, Perception +18, Persuasion +19, Stealth +9 |
| Damage Vulnerabilities | — |
| Damage Resistances | lightning; thunder |
| Damage Immunities | — |
| Condition Immunities | frightened |
| Senses | blindsight 60 ft., darkvision 120 ft., passive Perception 28 |
| Languages | Common, Draconic, telepathy 120 ft. |
| Challenge | 22 |
If the dragon fails a saving throw, it can choose to succeed instead.
The dragon can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.
The dragon can burrow through solid rock at half its burrowing speed and can leave a 20-foot-diameter tunnel in its wake.
The dragon makes one Bite attack and two Claw attacks.
Melee Attack Roll: +15 to hit, reach 15 ft., one target. Hit: 19 (2d10 + 8) piercing damage plus 11 (2d10) thunder damage.
Melee Attack Roll: +15 to hit, reach 10 ft., one target. Hit: 15 (2d6 + 8) slashing damage.
The dragon exhales a pulse of high-pitched, nearly inaudible sound in a 90-foot cone. Each creature in that area must make a DC 23 Constitution saving throw. On a failed save, the creature takes 55 (10d10) 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.
The dragon makes one Claw attack.
The dragon uses Psychic Step or Spellcasting.
The dragon chooses one Medium 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 20 Dexterity saving throw or take 42 (12d6) bludgeoning damage.
The dragon casts one of the following spells, requiring no spell components and using Intelligence as the spellcasting ability (spell save DC 20):
1 each/day: dissonant whispers, hold monster, meld into stone, telekinesis, teleport