Dexterity +6, Constitution +10, Wisdom +7, Charisma +8
Deception +8, Perception +12, Stealth +6
+1
Blindsight 60 ft, Darkvision 120 ft
Common, Draconic
Acid
Traits
Legendary Actions
3 legendary actions; one at a time at the end of another creature’s turn, regaining spent uses at the start of its turn
Legendary Resistance
3/day. If the adult copper dragon fails a saving throw, it can choose to succeed instead.
Actions
Multiattack
The adult copper dragon can use its Frightful Presence. It then makes three attacks: one with its bite and two with its claws.
Bite
Melee Weapon Attack: +11 to hit, reach 10 ft.. Hit: 17 (2d10 + 6) piercing damage.
Claw
Melee Weapon Attack: +11 to hit, reach 5 ft.. Hit: 13 (2d6 + 6) slashing damage.
Frightful Presence
Each creature of the adult copper dragon's choice that is within 120 ft. of the dragon and aware of it must succeed on a DC 16 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 adult copper dragon's Frightful Presence for the next 24 hours.
Breath Weapons
Recharge 5–6. The adult copper dragon uses one of the following breath weapons.
Acid Breath. The adult copper dragon exhales acid in an 60-foot line (5 ft. wide). Each creature in that line must make a DC 18 Dexterity saving throw, taking 54 (12d8) acid damage on a failed save, or half as much damage on a successful one.
Slowing Breath. The adult copper dragon exhales gas in a 60-foot line (5 ft. wide). Each creature in that area must succeed on a DC 18 Constitution saving throw. On a failed save, the creature can't use reactions, its speed is halved, and it can't make more than one attack on its turn. In addition, the creature can use either an action or a bonus action on its turn, but not both. These effects last for 1 minute. The creature can repeat the saving throw at the end of each of its turns, ending the effect on itself with a successful save.
Tail
Melee Weapon Attack: +11 to hit, reach 15 ft.. Hit: 15 (2d8 + 6) bludgeoning damage.
Legendary Actions
Detect
The adult copper dragon makes a Wisdom (Perception) check.
Tail Attack
The adult copper dragon makes a tail attack.
Wing Attack
Costs 2 legendary actions. The adult copper dragon beats its wings. Each creature within 10 ft. of the adult copper dragon must succeed on a DC 19 Dexterity saving throw or take 13 (2d6 + 6) bludgeoning damage and be knocked prone. The adult copper dragon can then fly up to half its flying speed.