Ancient Blue Dragon
Gargantuan Dragon, lawful evil
- Armor Class
- 22 (natural armor)
- Hit Points
- 481 (26d20+208)
- Speed
- walk 40 ft., burrow 40 ft., fly 80 ft.
- Challenge Rating
- 23
| STR | DEX | CON | INT | WIS | CHA |
|---|---|---|---|---|---|
| 29 (+9) | 10 (+0) | 27 (+8) | 18 (+4) | 17 (+3) | 21 (+5) |
- Damage Immunities
- lightning
- Senses
- blindsight 60 ft., darkvision 120 ft., passive Perception 27
- Languages
- Common, Draconic
Special Abilities
If the dragon fails a saving throw, it can choose to succeed instead.
Actions
The dragon can use its Frightful Presence. It then makes three attacks: one with its bite and two with its claws.
Melee Weapon Attack: +16 to hit, reach 15 ft., one target. Hit: 20 (2d10 + 9) piercing damage plus 11 (2d10) lightning damage.
Melee Weapon Attack: +16 to hit, reach 10 ft., one target. Hit: 16 (2d6 + 9) slashing damage.
Melee Weapon Attack: +16 to hit, reach 20 ft., one target. Hit: 18 (2d8 + 9) bludgeoning damage.
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.
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.
The dragon makes a Wisdom (Perception) check.
The dragon makes a tail attack.
The dragon beats its wings. Each creature within 15 ft. 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.