Ancient Blue Dragon

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Image promptgargantuan ancient blue dragon, single colossal backswept horn, immense ridged cobalt and indigo scales crackling with static, wind-scoured hide, erupting from beneath vast desert dune, sand pouring off wings, ozone storm gathering in throat, endless muted desert, bruised electric sky, cold predatory slit eyes, titanic foreclaw braced, ambush explosion, dark fantasy, grimdark, painterly digital art, dramatic chiaroscuro lighting, muted desaturated palette with corrupted-crimson accents, weathered post-Cataclysm atmosphere, intricate high detail, cinematic composition

Gargantuan Dragon (Chromatic), Lawful Evil

CR 23LurkerUnderground

AC 22

Initiative +14 (24)

HP 481 (26d20 + 208)

Speed 40 ft., Burrow 40 ft., Fly 80 ft.

STR

save +9

DEX

save +7

CON

save +8

INT

save +4

WIS

save +10

CHA

save +7

Skills Perception +17, Stealth +7

Immunities Lightning

Senses Blindsight 60 ft., Darkvision 120 ft.;

Languages Common, Draconic

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: Hit: +16, reach 15 ft. 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, Failure: 10-foot-wide Line. 88 (16d10) Lightning dam- Success: age. 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): Detect Magic Invisibility Mage Hand Shatter At Will: , , , (level 3 version) Scrying Sending 1/Day Each: ,

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. In- The dragon uses Spellcasting to cast visibility 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. Shat- The dragon uses Spellcasting to cast ter (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. Bone Devil Bone Devil