Adult Dragon of Tranquility(Angelic Amalgation)

Multiattack. The dragon makes three attacks: one with its bite and two with its claws.

Radiant Bite. Melee Weapon Attack: +6 to hit, reach 10 ft., one target. Hit: 2d8 + 8 piercing damage plus 2d6 radiant damage. Adult Dragon of Tranquility takes 1d10 radiant damage.

Radiant Claw. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 2d6 + 2 slashing damage. Upon hitting with this attack, Adult Dragon of Tranquility can choose to take in order to deal an additional 3d8 radiant damage.

Divine Breath(Recharge 5–6). The dragon exhales a burst of blinding light in a 30ft cone. Each creature in that area must make a DC 17 Dexterity saving throw, taking 10d8 radiant damage on a failed save, or half as much damage on a successful one. Adult Dragon of Tranquility takes 3d12 radiant damage. If at least two creatures failed this save, or this attack hit three or more creatures, Adult Dragon of Tranquility can choose to make two Radiant Claw attacks.

Goddess' Song(Recharge 5–6). Adult Dragon of Tranquility takes 6d12 radiant damage and a snippet of a divine melody echoes in the air around it. Choose one of the following options at random:

• Ocean's Song. The sound and song of water flowing and waves crashing surrounds the area. Creatures within a 60ft radius of Adult Dragon of Tranquility must make a DC 17 Strength saving throw, taking 4d8 bludgeoning damage on a fail, or half that much on a success. Creatures who fail are also knocked prone.
• Tranquil Tune. A calm, soothing melody fills the air. Creatures within a 60ft radius of Adult Dragon of Tranquility must make a DC 17 Charisma saving throw, taking 4d8 psychic damage on a fail or half that much on a success. Creatures who fail are charmed by Adult Dragon of Tranquility, and cannot attack it until the end of their next turns.
• Resonant Aria. A high, piercing note erupts and resonates across the area. Creatures within a 60ft radius of Adult Dragon of Tranquility must make a DC 17 Constitution saving throw, taking 4d8 thunder damage on a success or half as much on a fail. Nonmagical objects automatically fail this save and take double damage. Creatures who fail this save are also deafened. This condition will be removed by a long rest, or being put under the effects of Lesser Restoration.
• Nosferatu's Melody. A slow, lethargic tune envelops the area. Creatures within a 60ft radius of Adult Dragon of Tranquility must make a DC 17 Wisdom saving throw taking 4d8 necrotic damage on a fail or half as much on a success. Creatures who fail this save have their maximum hitpoints reduced by the amount of necrotic damage they took.

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.

Holy Surge. The dragon can roll to recharge its Goddess' Song and Divine Breath actions. On a failed attempt, the dragon takes 4d8 radiant damage.

Claw Attack. The dragon makes a Radiant Claw.

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 2d6 + 4 bludgeoning damage and be knocked prone. The dragon can then fly up to half its flying speed.