Adult Copper Dragon A5E

The dragon attacks with its bite and twice with its claws. In place of its bite it can use Acid Spit.

Melee Weapon Attack: +12 to hit, reach 10 ft., one target. Hit: 22 (3d10 + 6) piercing damage plus 4 (1d8) acid damage.

Melee Weapon Attack: +12 to hit, reach 5 ft., one target. Hit: 19 (3d8 + 6) slashing damage.

Melee Weapon Attack: +12 to hit, reach 15 ft., one target. Hit: 19 (3d8 + 6) bludgeoning damage and the dragon pushes the target 10 feet away.

Melee Weapon Attack: +12 to hit, reach 5 ft., one target. Hit: 10 (1d8 + 6) piercing damage.

The dragon targets a creature within 60 feet forcing it to make a DC 19 Dexterity saving throw. The creature takes 16 (3d10) acid damage on a failure or half damage on a success. A creature that fails the save also takes 5 (1d10) ongoing acid damage. A creature can use an action to end the ongoing damage.

The dragon uses one of the following breath weapons:

The dragon exhales acid in a 60-foot-long 5-foot-wide line. Each creature in the area makes a DC 19 Dexterity saving throw taking 63 (14d8) acid damage on a failed save or half damage on a success. A creature that fails the save is blinded until the end of its next turn.

The dragon exhales toxic gas in a 60-foot cone. Each creature in the area makes a DC 19 Constitution saving throw becoming slowed for 1 minute on a failure. A creature repeats the saving throw at the end of each of its turns ending the effect on itself on a success.

The dragon magically takes the shape of a humanoid or beast or changes back into its true form. It reverts to its true form if it dies. Any equipment it is wearing or carrying is absorbed or borne by the new form (dragons choice). In the new form the dragons stats are unchanged except for its size. It can't use Acid Spit Breath Weapons Tail Attack or Wing Attack except in dragon form. In beast form it can attack only with its bite and claws if appropriate to its form. If the beast form is Large or smaller the reach of these attacks is reduced to 5 feet. In humanoid form it can attack only with its war pick.

When a creature the dragon can see within 10 feet hits the dragon with a melee attack, the dragon makes a tail attack against it.

Only one legendary action can be used at a time and only at the end of another creatures turn. It regains spent legendary actions at the start of its turn.

Each creature of the dragons choice within 120 feet that can hear it makes a DC 17 Charisma saving throw. On a failure, it is frightened for 1 minute. A creature repeats the saving throw at the end of its turns, ending the effect on itself on a success. When it succeeds on a saving throw or the effect ends for it, it is immune to Roar for 24 hours.

The dragon beats its wings. Each creature within 15 feet makes a DC 19 Dexterity saving throw. On a failure, it is pushed 10 feet away and knocked prone. The dragon can then fly up to half its fly speed.

The dragon magically teleports to an unoccupied space it can see within 30 feet and creates two illusory duplicates in different unoccupied spaces within 30 feet. These duplicates have an AC of 11, and a creature that hits one with an attack can make a DC 16 Intelligence (Investigation) check, identifying it as a fake on a success. The duplicates disappear at the end of the dragons next turn but otherwise mimic the dragons actions perfectly, even moving according to the dragons will.