ArianelleYukki and AdhirukYuna

Amphibious. Yukki and Yuna can breathe both air and water.

Duel-Linked Souls. Yukki and Yuna have resistance to all damage and share the same hit points. If one of them hits 0 hit points or dies, they both do.

Regeneration. At the start of Yukki and Yuna's turn; if they have at least 1 hit point, they regain 10 hit points each (20 total).

Draconic Spellcasting. Yukki and Yuna's spellcasting ability is Charisma (Spell save DC 17, +9 to hit with spell attacks). They may cast the following spells without material components:

2/day each: banishment, blight, dimension door, ice storm, wall of fire

Multiattack. Yukki and Yuna can make up to three attacks each: one with their bite and two with their claws. Alternatively, They can both cast one spell each.

Bite. Melee Weapon Attack: +10 to hit, reach 10 ft., one target. Hit: 17 (2d10 + 6) piercing damage.

Claw. Melee Weapon Attack: +10 to hit, reach 5 ft., one target. Hit: 13 (2d6 + 6) slashing damage.

Shapechange. Yukki and Yuna can change themselves into any humanoid form (keeping their statistics except their size) and back to normal as an action.

Breath Weapons (Recharge 3-6). Yukki or Yuna can replace their set of attacks to use one of the following breath weapons instead. Neither one is affected by this breath attack.

1. Fire Breath. Yukki or Yuna exhales fire in a 30-foot cone. Each creature in that area must make a DC 17 Dexterity saving throw, taking 55 (10d10) fire damage on a failed save, or half as much damage on a successful one.

2. Weakening Breath. Yukki or Yuna exhales gas in a 30-foot cone. Each creature in that area must succeed on a DC 17 Strength saving throw or have disadvantage on Strength-based attack rolls, Strength checks, and Strength 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.

3. Cold Breath. Yukki or Yuna exhales an icy blast in a 30-foot cone. Each creature in that area must make a DC 17 Constitution saving throw, taking 54 (12d8) cold damage on a failed save, or half as much damage on a successful one.

4. Paralyzing Breath. Yukki or Yuna exhales paralyzing gas in a 30-foot cone. Each creature in that area must succeed on a DC 17 Constitution saving throw or be paralyzed 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.