Ancient Blue Dragon
CR 23 Gargantuan lightning dragon with 481 HP and AC 22, dealing 88 lightning damage in a 120-foot line (DEX DC 23 half). Multiattack delivers three Rend strikes at +16 reach 15 ft...
Ancient Blue Dragon. Gargantuan dragon, lawful evil.
Languages: Common, Draconic
Traits: Legendary Resistance (4/Day, or 5/Day in Lair)
Gargantuan dragon · lawful evil
AC 22 · HP 481 · Speed 40 ft., fly 80 ft., swim 20 ft., climb 20 ft., burrow 40 ft. · Initiative +14
| STR | DEX | CON | INT | WIS | CHA | |
|---|---|---|---|---|---|---|
| Score | 29 | 10 | 27 | 18 | 17 | 25 |
| Mod | +9 | +0 | +8 | +4 | +3 | +7 |
| Save | +9 | +7 | +8 | +4 | +10 | +7 |
Skills Perception +17, Stealth +7 · Senses blindsight 60 ft., darkvision 120 ft., passive Perception 27 · Challenge 23 (PB +7)
Immunities Lightning
Traits
Legendary Resistance (4/Day, or 5/Day in Lair). If the dragon fails a saving throw, it can choose to succeed instead.
Actions
Lightning Breath. Dexterity Saving Throw: DC 23, each creature in a 120-foot-long, 10-foot-wide Line. Failure: 88 (16d10) Lightning damage. Success: Half damage.
Multiattack. The dragon makes three Rend attacks. It can replace one attack with a use of Spellcasting to cast Shatter (level 3 version).
Rend. Melee Attack Roll: +16, reach 15 ft. 18 (2d8 + 9) Slashing damage plus 11 (2d10) Lightning damage.
Spellcasting. The dragon casts one of the following spells, requiring no Material components and using Charisma as the spellcasting ability (spell save DC 22): - **At Will:** Detect Magic, Invisibility, Mage Hand, Shatter - **1/Day Each:** Scrying, Sending