Legendary Resistance (3/Day) Let’s say that the Ancient Copper Dragon fails a saving throw, but it is still able to choose to succeed instead.

Take Action

Multiattack: The dragon is able to use its frightening presence. It then launches three attacks: one with its teeth and two with its claws. These are detailed below.

Take a biteThis monster can use the bite attack to make a Melee weapon. Attack: +15 to hit, reach fifteen feet, one target Hit: 19 (2d10+8) piercing.

ClawIt can use the claw to make a melee weapon. Attack: +15 to hit, reach ten feet, one target Hit: 15 (2d6 + 8) slashing damage.

TailIt can apply tail attack to make Melee Weapon Attack +15 to hit, reach twenty feet, and one target. Hit: 17 (2d8+8) bludgeoning.

Frightful Presence: All creatures are dependent on the dragon’s choice. It must be within 120 yards of the dragon. A creature that can make a saving throw once more at the end of each round, or just by ending its effect on itself if it succeeds. If a creature’s save throw is successful, it will end the effect. However, for the next 24hrs, the creature will remain immune to any dragon’s fearful presence.

Breath Weapons (Recharge 5-6): The dragon may use either one of the two breath weapons. These are Slowing and Acid breath.

Acid Breath The dragon is able to inhale the acid within a line of 90 feet, which is nearly 10 times its normal size. Every creature within that line must be able to make a DC 22 Dexterity saving throw, and also take 63 (14d8) acid damages if it fails to save.

Slowing down your breath The dragon can exhale the gas in a cone measuring 90 feet. Each creature within that area must succeed on a DC 22 Constitution saving throw. If a save fails, the creature cannot use its reactions. The creature’s speed has been reduced to half. It cannot perform more than one attack per round. It can choose to use either one or two bonus actions per turn. It cannot use both. These effects last about one minute. This creature can make a saving roll at the end each turn. It can also stop the effect by making an effective save.

Change your shapeThe ability to magically transform into the Humanoid, another beast with a challenge rating not higher than its own, or back into its original form. If it is killed, it might return to its original form. It took any equipment or other items it was carrying. (It does not depend on the dragon’s decisions.

The dragon can keep its alignment, hit points, hit dice, ability to talk, proficiencies and legendary resistance, lair actions, intelligence, wisdom and Charisma scores in the new form. You can replace any of your stats or abilities with the new form.

Legendary Actions

This dnd5e monster is normaly able take three legendary actions by selecting one of the following options. This legendary action can only be used at end of turn by another creature. It must perform the legendary actions at each turn’s beginning.

Detect: The Dragon is able to make a Wisdom (Perception check).

Tail Attack: A tail Attack is also possible for the Dragon.

Wing Attack (Costs two Actions): This monster is actually stronger than its own wings. Every creature within 15 feet of the dragon must succeed on a DC 23 Dexterity saving Throw or else take 15 (2d6+8) bludgeoning damages and be knocked out. The dragon can fly at half of its speed.

Attributes Of Ancient Copper Dragon

AC 21 (Natural Armor).
Alignment Chaotic Good
CHA 19
CON 25
Challenge Rating 21
DEX 12
HP 350 (20d20+140).
INT 20
Immunities Acid
Languages Draconic and Common
Passive Perception 27
Roll 0 Eat 1d20 + 15 d10+8
Roll 1 Claw 1d20 + 15 d6+8
Roll 2 Tail 1d20 + 15 d8+8
Roll 3 Acid Breath 1d20 + 0, 0 14d8
STR 27
Throws to Save Dex +8, Con+14, Wis+10, Cha +11
Senses Blindsight 60 Ft. Darkvision 120 Ft.
Size Gargantuan
Skills Perception +17 and Deception +11 respectively, Stealth +8
Speed 40 ft. Climb 40 ft. Fly 80 ft.
Type dragon
WIS 17