Ancient Blue Dragon

Gargantuan Dragon (Chromatic), Lawful Evil
Initiative +14 (24)
AC 22
HP 481 (26d20 + 208)
Speed 40 ft., Burrow 40 ft., Fly 80 ft.
MOD
SAVE
MOD
SAVE
MOD
SAVE

Str
29
+9
+9
Dex
10
+0
+7
Con
27
+8
+8

Int
18
+4
+4
Wis
17
+3
+10
Cha
25
+7
+7

Skills Perception +17, Stealth +7
Immunities Lightning
Senses Blindsight 60 ft., Darkvision 120 ft., Passive Perception 27
Languages Common, Draconic
CR 23 (XP 50 000, or 62 000 in Lair; PB +7)

Traits

Legendary Resistance (4/Day, or 5/Day in Lair). If the dragon fails a saving throw, it can choose to succeed instead.

Actions

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. Hit: 18 (2d8 + 9) Slashing damage plus 11 (2d10) Lightning damage.

Lightning Breath (Recharge 5–6). Dexterity Saving Throw: DC 23, each creature in a 120-foot-long, 10-foot-wide Line. Failure: 88 (16d10) Lightning damage. Success: Half 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 (level 3 version)
1/Day Each: Scrying, Sending

Legendary actions

Legendary Action Uses: 3 (4 in Lair). Immediately after another creature's turn, the dragon can expend a use to take one of the following actions. The dragon regains all expended uses at the start of each of its turns.

Cloaked Flight. The dragon uses Spellcasting to cast Invisibility on itself, and it can fly up to half its Fly Speed. The dragon can't take this action again until the start of its next turn.

Sonic Boom. The dragon uses Spellcasting to cast Shatter (level 3 version). The dragon can't take this action again until the start of its next turn.

Tail Swipe. The dragon makes one Rend attack.

Arrogant and imperious, blue dragons are chromatic dragons that crave control and collect followers like other dragons hoard treasure. They seek to transform their territories into empires, domains to be feared by nations. Blue dragons have sharp features with piercing horns and scales that range from sapphire to the shades of stormy skies. They dwell in deserts and badlands, particularly regions with dramatic spires from whose tops they might see for miles. They seek lairs near sites of symbolic power, such as the abandoned fortresses of giants, the colossi of fallen empires, or monuments raised by their followers. Regalia of rulership and artistic masterpieces fill blue dragons' hoards. These dragons have no interest in treasures that are common or flawed, preferring one-of-a-kind gemstones, the crowns of fallen royals, and magic items capable of spreading the dragons' influence.
Habitat: Coastal, Desert
Treasure: Relics
Monster Manual 2024 (BR)

Dragon bleu, ancien [FR]
Dragón azul anciano [ES]
  1. DnD 5.5 Monsters › Ancient Blue Dragon
Ancient Blue Dragon