# Ancient Blue Dragon (Chromatic)

*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

**Damage Immunities** lightning

**Senses** blindsight 60 ft., darkvision 120 ft., passive Perception 27

**Languages** Common, Draconic

**Challenge** 23 (50,000 XP)

***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.