Copper Dragon Bard

Spellcasting. The dragon is a 4th-level spellcaster. Its spellcasting ability is Charisma (spell save DC 13, +5 to hit with spell attacks). It has the following bard spells prepared:

Cantrips (at will): friends, mage hand, vicious mockery

1st level (4 slots): charm person, healing word, heroism, sleep, thunderwave

2nd level (3 slots): invisibility, shatter

Song of Rest. The dragon can perform a song while taking a short rest. Any ally who hears the song regains an extra 1d6 hit points if it spends any Hit Dice to regain hit points at the end of that rest. The dragon can confer this benefit on itself as well.

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

Bite. Melee Weapon Attack: +7 to hit, reach 10 ft., one target. Hit: 15 (2d10 + 4) piercing damage.

Claw. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 11 (2d6 + 4) slashing damage.

Breath Weapons (Recharge 5–6). The dragon uses one of the following breath weapons.

Acid Breath. The dragon exhales acid in an 40-foot line that is 5 feet wide. Each creature in that line must make a DC 14 Dexterity saving throw, taking 40 (9d8) acid damage on a failed save, or half as much damage on a successful one.

Slowing Breath. The dragon exhales gas in a 30-foot cone. Each creature in that area must succeed on a DC 14 Constitution saving throw. On a failed save, the creature can't use reactions, its speed is halved, and it can't make more than one attack on its turn. In addition, the creature can use either an action or a bonus action on its turn, but not both. These effects last for 1 minute. The creature can repeat the saving throw at the end of each of its turns, ending the effect on itself with a successful save.

Humanoid Form. The dragon magically transforms into any humanoid that is Medium or Small, while retaining its game statistics (other than it’s size). This transformation ends if the dragon is reduced to 0 hit points or uses a bonus action to end it.

Taunt (2/Day). The dragon can targets one creature within 30 feet of it. If the target can hear the dragon, the target must succeed on a DC 13 Charisma saving throw or have disadvantage on ability checks, attack rolls, and saving throws until the start of the dragon’s next turn.