Young Sea Dragon

Large dragon, neutral evil

Armor Class 18 (natural armor)

Hit Points 152 (16d10 + 64)

Speed 40 ft., fly 80 ft., swim 50 ft.

21 (+5) 10 (+0) 19 (+4) 15 (+2) 13 (+1) 17 (+3)

Saving Throws Dex +4, Con +8, Wis +5, Cha +7

Skills Perception +9, Stealth +4

Damage Immunities cold

Senses blindsight 30 ft. darkvision 120 ft. passive Perception 19

Languages Common, Draconic

Challenge 9 (5,000 XP)

Amphibious. The dragon can breathe air and water.

Siege Monster. The dragon deals double damage to objects and structures.


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

Bite. Melee Weapon Attack: +9 to hit, reach 10 ft., one target. Hit: 16 (2d10 + 5) piercing damage plus 5 (1d10) cold damage.

Claw. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 12 (2d6 + 5) slashing damage.

Tidal Breath (Recharge 5-6). The dragon exhales a crushing wave of frigid seawater in a 30-foot cone. Each creature in that area must make a DC 16 Dexterity saving throw. On a failure, the target takes 27 (5d10) bludgeoning damage and 27 (5d10) cold damage, and is pushed 30 feet away from the dragon and knocked Prone. On a successful save the creature takes half as much damage and isn’t pushed or knocked prone.