Lungs of a Millenia. Carthos does not require air and water to survive.
Legendary Resistance (4/Day). If Carthos fails a saving throw, it can choose to succeed instead.
Spellcasting. Carthos is a 20th-level spellcaster. Its spellcasting ability is Intelligence (spell save DC 22, +14 to hit with spell attacks).
Cantrips (at will): fire bolt, ray of frost, mage hand, mending, shocking grasp
1st level (4 slots): detect magic, identify, chromatic orb, magic missile
2nd level (3 slots): invisibility, shadow blade, misty step
3rd level (3 slots): counterspell, dispel magic, haste
4th level (3 slots): banishment, black tentacles, summon greater demon
5th level (3 slots): cloudkill, scrying, wall of force
6th level (2 slot): globe of invulnerability, circle of death
7th level (2 slot): teleport, simulacrum
8th level (1 slot): control weather
9th level (1 slot): time stop, power word kill
Multiattack. Carthos can use its Frightful Presence. It then makes five attacks: one with its bite and four with its claws.
Bite. Melee Weapon Attack: +19 to hit, reach 15 ft., one target. Hit: 21 (2d10 + 10) piercing damage plus 6 (1d12) necrotic damage plus 6 (1d12) radiant damage.
Claw. Melee Weapon Attack: +19 to hit, reach 10 ft., one target. Hit: 19 (2d6 + 10) slashing damage.
Tail. Melee Weapon Attack: +19 to hit, reach 20 ft., one target. Hit: 19 (2d8 + 10) bludgeoning damage.
Frightful Presence. Each creature of Carthos's choice that is within 120 feet of the dragon and aware of it must succeed on a DC 25 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 Weapons (Recharge 5–6). Carthos uses one of the following breath weapons.
Nephalem Breath. Carthos exhales sparkling energy in a 10- foot wide, 120-foot long beam. Each creature in that area must make a DC 25 Dexterity saving throw, taking 38 (7d10) necrotic damage plus 38 (7d10) radiant damage on a failed save, or half as much damage on a successful one.
Debilitating Breath. Carthos exhales gas in a 90-foot cone. Each creature in that area must succeed on a DC 25 Constitution saving throw or have disadvantage on attack rolls made with weapons, ability checks, and saving throws 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.
Change Shape. Carthos 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, Carthos 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.
Carthos 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.
Tail Attack. Carthos makes a tail attack.
Wing Attack (Costs 2 Actions). Carthos beats its wings. Each creature within 15 feet of the dragon must succeed on a DC 25 Dexterity saving throw or take 17 (2d6 + 10) bludgeoning damage and be knocked prone. The dragon can then fly up to half its flying speed.
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