Cdramon

Amphibious. The Cdramon can breathe air and water.

Multiattack. The Cdramon makes two attacks: one with its bite and one with its tail.

Bite. Melee Weapon Attack: +11 to hit, reach 10 ft., one target. Hit: 17 (2d10 + 6) piercing damage plus 4 (1d8) cold damage.

Tail. Melee Weapon Attack: +11 to hit, reach 15 ft., one target. Hit: 15 (2d8 + 6) bludgeoning damage.

Cold Breath (Recharge 3–6). The Cdramon exhales an icy blast in a 30-foot cone. Each creature in that area must make a DC 16 Constitution saving throw, taking 26 (6d8) cold damage on a failed save, or half as much damage on a successful one. Additionally if a creature gets reduced to 0 hit point in that way the creature dies without having the chance to roll death saves.

Has a reaction Cdramon may decide to dive under the surface or emerge from the depths to avoid an attack.

It may also use a reaction to do a surprise attack on a vessel using either it's tail or it's breath attack.

Tail. Melee Weapon Attack: +11 to hit, reach 15 ft., one target. Hit: 15 (2d8 + 6) bludgeoning damage.

Cold Breath (Recharge 3–6). The Cdramon exhales an icy blast in a 30-foot cone. Each creature in that area must make a DC 16 Constitution saving throw, taking 26 (6d8) cold damage on a failed save, or half as much damage on a successful one. Additionally if a creature gets reduced to 0 hit point in that way the creature dies without having the chance to roll death saves.