Gargantuan dragon, Neutral
| Armor Class | 21 |
|---|---|
| Hit Points | 420 (24d20 + 168) |
| Speed | 40 ft., burrow 30 ft., fly 80 ft. |
| STR | DEX | CON | INT | WIS | CHA |
|---|---|---|---|---|---|
| 26 (+8) | 14 (+2) | 25 (+7) | 24 (+7) | 18 (+4) | 23 (+6) |
| Saving Throws | Con +14, Dex +9 |
|---|---|
| Skills | History +14, Insight +11, Perception +11, Stealth +9 |
| Damage Vulnerabilities | — |
| Damage Resistances | necrotic |
| Damage Immunities | — |
| Condition Immunities | — |
| Senses | Blindsight 60 ft., Darkvision 120 ft., passive Perception 21 |
| Languages | Common, Draconic; telepathy 120 ft. |
| Challenge | 22 |
If the dragon fails a saving throw, it can choose to succeed instead.
The dragon makes three Rend attacks. It can replace one attack with a use of (A) Time-Warping Breath or (B) Spellcasting to cast Thunderwave (level 2 version).
Melee Attack Roll: +15, reach 15 ft. Hit: 19 (2d10 + 8) Slashing damage plus 9 (2d8) Necrotic damage.
con DC 22, each creature in a 90-foot Cone [Area of Effect]. Failure: 72 (16d8) Necrotic damage. Success: Half damage.
wis DC 22, each creature that isn't currently affected by this breath in a 90-foot Cone [Area of Effect]. Failure: The target's Speed is halved, it can't take Reactions, and it can take either an action or a Bonus Action on its turn, not both. It repeats the save at the end of each of its turns, ending the effect on itself on a success. After 1 minute, it succeeds automatically.
The dragon moves up to half its Speed, and it makes one Rend attack.
The dragon uses Spellcasting to cast Thunderwave (level 2 version).
The dragon magically raises broken, ancient ruins in a 20-foot-radius, 60-foot-high Cylinder [Area of Effect] centered on a point it can see within 120 feet. Ground in the Cylinder [Area of Effect] becomes Difficult Terrain. Each creature in the Cylinder [Area of Effect] when it appears is subjected to the following effect. str DC 22. Failure: 13 (3d8) Bludgeoning damage, and the target has the Prone condition. Success or Failure: The dragon can't take this action again until the start of its next turn.
The dragon casts one of the following spells, requiring no spell components and using Intelligence as the spellcasting ability (spell save DC 22):
At will: Detect Magic, Shapechange (Beast or Humanoid form only, no Temporary Hit Points gained from the spell, and no Concentration or Temporary Hit Points required to maintain the spell), Thunderwave (level 2 version)
1 each/day: Legend Lore (as an action), Sequester