Amphibious. The dragon can breathe both air and water.
Legendary Resistance (3/day). If the dragon fails a saving throw, it can choose to succeed instead.
Metal Sense. An adult cobalt dragon can sense cobalt in any form that is within 120 feet of it.
Multiattack. The 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., one target. Hit: 17 (2d10 + 6) piercing damage.
Claw. Melee Weapon Attack: +11 to hit, reach 5 ft., one target. Hit: 13 (2d6 + 6) slashing damage.
Tail. Melee Weapon Attack: +11 to hit, reach 15 ft., one target. Hit: 15 (2d8 + 6) bludgeoning damage.
Frightful Presence. Each creature of the dragon's choice that is within 120 feet 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 dragon's Frightful Presence for the next 24 hours.
Breath Weapon (Recharge 5–6). The dragon uses its breath weapon.
Magnetic Pulse. The dragon exhales a magnetic pulse in an 60-foot line that is 5 feet wide. Each creature in that line must make a DC 18 Constitution saving throw, taking 54 (12d8) force damage on a failed save, or half as much damage on a successful one. Additionally, creatures caught in the line who are wearing medium or heavy armor made of metal, take an additional 11 (3d6) thunder damage.
Change Shape. The dragon magically polymorphs into a humanoid or beast that has a challenge rating no higher than its own, or 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 (the dragon's choice).
In a new form, the dragon retains its alignment, hit points, Hit Dice, ability to speak, proficiencies, Legendary Resistance, lair actions, and Intelligence, Wisdom, and Charisma scores, as well as this action. Its statistics and capabilities are otherwise replaced by those of the new form, except any class features or legendary actions of that form.
The dragon can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. The dragon regains spent legendary actions at the start of its turn.
Detect. The dragon makes a Wisdom (Perception) check.
Tail Attack. The dragon makes a tail attack.
Wing Attack (Costs 2 Actions). The dragon beats its wings. Each creature within 10 feet of the dragon must succeed on a DC 19 Dexterity saving throw or take 13 (2d6 + 6) bludgeoning damage and be knocked prone. The dragon can then fly up to half its flying speed.
Description
A cobalt dragon's scales are deep blue at birth, with odd patches of darker and lighter scales, which become more prevalent as they age. They are possibly the progenitors of Kobolds, as they look like them, but this has yet to be proven by scholars.
Innate Spellcasting. If a cobalt dragon gains the ability to innately cast spells, it can cast each one once per day, requiring no material components. It can cast certain spells based on its age category, as shown below:
Young (spell save DC 13). blur, entangle
Adult (spell save DC 16). blur, entangle, greater invisibility, phantasmal killer
Ancient (spell save DC 19). blur, entangle, greater invisibility, mental prison, phantasmal killer
Telepathy. All cobalt dragons have a 10% chance of being born with 60 feet of telepathy. However, once they reach adult age, they automatically gain telepathy to a range of 60 feet.
Lair and Lair Actions
On initiative count 20 (losing initiative ties), the dragon takes a lair action to cause one of the following effects:
- Grasping roots and vines erupt in a 20-foot radius centered on a point on the ground that the dragon can see within 120 feet of it. That area becomes difficult terrain, and each creature there must succeed on a DC 15 Strength saving throw or be restrained by the roots and vines. A creature can be freed if it or another creature takes an action to make a DC 15 Strength check and succeeds. The roots and vines wilt away when the dragon uses this lair action again or when the dragon dies.
- The dragon chooses a 10-foot-square area on the ground that it can see within 120 feet of it. The ground in that area turns into 3-foot-deep mud. Each creature on the ground in that area when the mud appears must succeed on a DC 15 Dexterity saving throw or sink into the mud and become restrained. A creature can take an action to attempt a DC 15 Strength check, freeing itself or another creature within its reach and ending the restrained condition on a success. Moving 1 foot in the mud costs 2 feet of movement. On initiative count 20 on the next round, the mud hardens, and the Strength DC to work free increases to 20.
- Tendrils of roiling muck extend from the dragon's lair to grasp up to three creatures of the dragon's choice that it can see within the lair. A targeted creature must succeed on a DC 15 Strength saving throw or be restrained until initiative count 20 on the next round.
Regional Effects
The region containing a legendary copper dragon’s lair is warped by the dragon’s magic, which creates one or more of the following effects:
- Within 1 mile of its lair, the dragon leaves no physical evidence of its passage unless it wishes to. Tracking it there is impossible except by magical means. In addition, it ignores movement impediments and damage from plants in this area that are neither magical nor creatures.
- Tiny beasts such as rodents and birds that are normally unable to speak gain the magical ability to speak and understand Draconic while within 1 mile of the dragon’s lair. These creatures speak well of the dragon, but can’t divulge its whereabouts.
- Intelligent creatures within 1 mile of the dragon’s lair are prone to fits of giggling. Even serious matters suddenly seem amusing.
If the dragon dies, the tiny beasts' intelligence fades over the course of 1d10 days. The other effects end immediately.
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