Ancient Copper Dragon

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Image promptgargantuan ancient copper dragon, weathered verdigris-streaked copper scales green with tarnish, broad frilled crest, two backswept horns, sly glittering eyes, corrosive acid breath and slowing haze, crouched on rust-red canyon ledge, drifting dust, folded corroded-metal wings, tail curled around jagged rock, bruised desert-mountain sky, predatory patient gaze, 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 (Metallic), Chaotic Good

CR 21ControllerUnderground

AC 21

Initiative +15 (25)

HP 367 (21d20 + 147)

Speed 40 ft., Climb 40 ft., Fly 80 ft.

STR

save +8

DEX

save +8

CON

save +7

INT

save +5

WIS

save +10

CHA

save +6

Skills Deception +13, Perception +17, Stealth +8

Immunities Acid

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 (A) Slowing Breath Mind Spike or (B) Spellcasting to cast (level 5 version).

Rend. Melee Attack Roll: Hit: +15, reach 15 ft. 19 (2d10

8) Slashing damage plus 9 (2d8) Acid damage.

Acid Breath (Recharge 5–6) Dexterity Saving Throw: . DC 22, each creature in an 90-foot-long, 10-foot- Failure: Success: wide Line. 63 (14d8) Acid damage. Half damage.

Slowing Breath. Constitution Saving Throw: DC 22, Failure: each creature in a 90-foot Cone. The target can’t take Reactions; its Speed is halved; and it can take either an action or a Bonus Action on its turn, not both. This effect lasts until the end of its next turn.

Spellcasting. The dragon casts one of the following spells, requiring no Material components and using Charisma as the spellcasting ability (spell save DC 21): Detect Magic Mind Spike At Will: , (level 5 version), Minor Illusion Shapechange , (Beast or Humanoid form only, no Temporary Hit Points gained from the spell, and no Concentration or Temporary Hit Points required to maintain the spell) Greater Restoration Major Image 1/Day Each: , , Project Image

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.

Giggling Magic. Charisma Saving Throw: DC 21, one Failure: creature the dragon can see within 120 feet. 31 (9d6) Psychic damage. Until the end of its next turn, the target rolls 1d8 whenever it makes an ability check or attack roll and subtracts the number rolled from the Failure or Success: D20 Test. The dragon can’t take this action again until the start of its next turn.

Mind Jolt. Mind The dragon uses Spellcasting to cast

Spike (level 5 version). The dragon can’t take this action again until the start of its next turn.

Pounce. The dragon moves up to half its Speed, and it makes one Rend attack. Couatl Couatl