> [Monsters, NPC and Animals](srd_monsters.md)

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# Ancient Blue Dragon

- Alias: [Dragon bleu vénérable](hd_monsters_dragon_bleu_venerable.md)
-  Gargantuan dragon, lawful evil
- **Armor Class** 22 (natural armor)
- **Hit Points** 481 (26d20 + 208)
- **Speed** 40 ft., burrow 40 ft., fly 80 ft.

|STR|DEX|CON|INT|WIS|CHA|
|---|---|---|---|---|---|
|29 (+9)|10 (+0)|27 (+8)|18 (+4)|17 (+3)|21 (+5)|

- **Saving Throws** Dex +7, Con +15, Wis +10, Cha +12
- **Skills** Perception +17, Stealth +7
- **Senses** blindsight 60 ft., darkvision 120 ft., passive Perception 27
- **Languages** Common, Draconic
- **Challenge** 23 (50000 XP)
- **Damage Immunities** lightning

## Special Features

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

## Actions

**_Multiattack_**. The dragon can use its Frightful Presence. It then makes three attacks: one with its bite and two with its claws.

**_Bite_**. Melee Weapon Attack: +16 to hit, reach 15 ft., one target.

_Hit_: 20 (2d10 + 9) piercing damage plus 11 (2d10) lightning damage.

**_Claw_**. Melee Weapon Attack: +16 to hit, reach 10 ft., one target.

_Hit_: 16 (2d6 + 9) slashing damage.

**_Tail_**. Melee Weapon Attack: +16 to hit, reach 20 ft., one target.

_Hit_: 18 (2d8 + 9) bludgeoning damage.

**_Frightful Presence_**. Each creature of the dragon's choice that is within 120 feet of the dragon and aware of it must succeed on a DC 20 Wisdom saving throw or become frightened for 1 minute. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. If a creature's saving throw is successful or the effect ends for it, the creature is immune to the dragon's Frightful Presence for the next 24 hours.

**_Lightning Breath (Recharge 5-6)_**. The dragon exhales lightning in a 120-foot line that is 10 feet wide. Each creature in that line must make a DC 23 Dexterity saving throw, taking 88 (16d10) lightning damage on a failed save, or half as much damage on a successful one.

## 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.

**_Tail Attack_**. The dragon makes a tail attack.

**_Wing Attack (Costs 2 Actions)_**. The dragon beats its wings. Each creature within 15 feet of the dragon must succeed on a DC 24 Dexterity saving throw or take 16 (2d6 + 9) bludgeoning damage and be knocked prone. The dragon can then fly up to half its flying Speed.

