Basic Stats
- Size/Type: Large Dragon
- Alignment: Neutral
- Armor Class: 19 (natural armor)
- Hit Points: 200 (16d10 + 112)
- Speed: 40 ft., swim 90 ft.
Ability Scores
- Strength: 22 (+6)
- Dexterity: 16 (+3)
- Constitution: 24 (+7)
- Intelligence: 14 (+2)
- Wisdom: 15 (+2)
- Charisma: 18 (+4)
Saving Throws
- Dexterity: +8
- Constitution: +12
- Wisdom: +7
- Charisma: +9
Skills
- Perception: +12
- Stealth: +8
Damage Immunities
- Cold
- Poison
Senses
- Darkvision 120 ft., Blindsight 60 ft., Passive Perception 22
Languages
- Common, Draconic, Primordial
Challenge Rating
- 16 (15,000 XP)
Traits
- Legendary Resistance (3/Day): If the dragon fails a saving throw, it can choose to succeed instead.
- Amphibious: The dragon can breathe air and water.
Actions
- Multiattack: The dragon makes three attacks: one with its bite and two with its claws.
- Bite: Melee Weapon Attack: +11 to hit, reach 10 ft., one target. Hit: 17 (2d10 + 6) piercing damage plus 10 (3d6) bludgeoning damage.
- Claw: Melee Weapon Attack: +11 to hit, reach 5 ft., one target. Hit: 13 (2d6 + 6) slashing damage.
- Tail: Melee Weapon Attack: +11 to hit, reach 15 ft., one target. Hit: 15 (2d8 + 6) bludgeoning damage.
- Tidal Wave Breath (Recharge 5-6): The dragon exhales a powerful tidal wave in a 60-foot cone. Each creature in that area must make a DC 19 Strength saving throw, taking 56 (16d6) bludgeoning damage and being knocked prone or pushed 20 feet away (dragon’s choice) on a failed save, or half as much damage and not knocked prone or pushed on a successful one.
- Water Jet: The dragon releases a jet of water in a 30-foot line that is 5 feet wide. Each creature in that line must make a DC 19 Dexterity saving throw, taking 21 (6d6) bludgeoning damage on a failed save, or half as much on a successful one, and being pushed 10 feet away.
Legendary Actions
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.
- Detect: The dragon makes a Wisdom (Perception) check.
- Tail Attack: The dragon makes a tail attack.
- Swim Surge (Costs 2 Actions): The dragon moves up to half its swimming speed without provoking opportunity attacks.
Special Abilities
- Oceanic Grace: The dragon has advantage on Dexterity (Acrobatics) checks and saving throws while underwater, and its swim speed increases by 10 ft. when moving with a current.
- Tidal Resilience: The dragon has resistance to bludgeoning damage from nonmagical attacks while submerged in water.