Bronze Dragon Spelljammer

Amphibious. The dragon can breathe air and water.

Innate Spellcasting. The dragon’s innate spellcasting ability is Charisma. It can innately cast the following spells, requiring no components:

At will: mage hand

3/day each: air bubble, misty step, nondetection

Steady as She Goes. On the deck of a ship, the dragon has advantage on ability checks and saving throws made against effects that would knock it prone or shove it overboard.

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

Bite. Melee Weapon Attack: +8 to hit, reach 10 ft., one target. Hit: 16 (2d10 + 5) piercing damage.

Claw. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 12 (2d6 + 5) slashing damage.

Force Grenade. The dragon throws a grenade up to 60 feet, and the grenade explodes in a 20-foot-radius sphere. Each creature in that area must make a DC 15 Dexterity saving throw, taking 17 (5d6) force damage on a failed save, or half as much damage on a successful one. After the dragon throws the grenade, roll a d6; on a roll of 4 or lower, the dragon has no more grenades to throw.

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

Lightning Breath. The dragon exhales lightning in a 60- foot line that is 5 feet wide. Each creature in that line must make a DC 15 Dexterity saving throw, taking 55 (10d10) lightning damage on a failed save, or half as much damage on a successful one.

Repulsion Breath. The dragon exhales repulsion energy in a 30-foot cone. Each creature in that area must succeed on a DC 15 Strength saving throw. On a failed save, the creature is pushed 40 feet away from the dragon.

Alter Shape. The dragon magically transforms into a space mollymawk or a giff shipmate and retains its alignment, damage immunities, hit points, and Hit Dice, as well as its Intelligence, Wisdom, and Charisma scores. This transformation ends if the dragon is reduced to 0 hit points or if it uses another bonus action to end it.