D&D 5e 2024 rules. Stats use the 2024 rules from the System Reference Document 5.2.1.
The Ancient Copper Dragon is a Gargantuan dragon, with Armor Class 21, 367 hit points, and Challenge Rating 21. The ancient copper dragon is a colossal, witty metallic dragon that prizes humor and riddles over mindless violence.
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 or (B) Spellcasting to cast Mind Spike (level 5 version). Acid Breath (Recharge 5–6). Dexterity Saving Throw: DC 22, each creature in an 90-foot-long, 10-foot-wide Line. Failure: 63 (14d8) Acid damage. Success: Half damage. Slowing Breath. Constitution Saving Throw: DC 22, each creature in a 90-foot Cone. Failure: 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. 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 creature the dragon can see within 120 feet. Failure: 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 D20 Test. Failure or Success: The dragon can't take this action again until the start of its next turn. Mind Jolt. The dragon uses Spellcasting to cast Mind 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.
367 hit points.
Challenge Rating 21.
AC 21.
Speed 40 ft., climb 40 ft., fly 80 ft.
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