Baby Black Dragon of Tranquility

Amphibious. The dragon can breathe air and water.

Legendary Resistance (3/Day). If the dragon fails a saving throw, it can choose to succeed instead.

Multiattack. The dragon can use two attacks per turn

Bite. Melee Weapon Attack: +4 to hit, reach 10 ft., one target. Hit: 8 (2d8) piercing damage plus 3 (1d6) acid damage.

Claw. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 7 (2d6 ) slashing damage.

Tail. Melee Weapon Attack:  reach 15 ft., all targets in range. Hit: 7 (2d8 ) bludgeoning damage. DC 15 DEX Saving Throw

Acid Breath (Recharge 2–3). The dragon exhales acid in a 60-­foot line that is 5 feet wide. Each creature in that line must make a DC 15 Dexterity saving throw, taking 12 (4d6) acid damage on a failed save, or half as much damage on a successful one.

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.

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.