Ancient Blue Dragon

Gargantuandragon,lawful evil
Armor Class
22
Hit Points
481(26d20+ 208)
Speed
40 ft., burrow 40 ft., fly 80 ft. ft.
str
29 (+9)
dex
10 (0)
con
27 (+8)
int
18 (+4)
wis
17 (+3)
cha
21 (+5)
Proficiency Bonus
+7.0
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(50000 XP)

Legendary Resistance .If the dragon fails a saving throw, it can choose to succeed instead.

Description

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 .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 .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.