Adult Sea Dragon
Huge Dragon, varies
- Armor Class 19(natural armor)
- Hit Points 250(20d12+120)
- Speed 40ft., swim 80ft., fly 80ft.
STR DEX CON INT WIS CHA 25 (+7) 10 (+0) 23 (+6) 16 (+3) 15 (+2) 19 (+4)
- Saving Throws Dex +5, Con +11, Wis +7, Cha +9
- Skills Perception +7, Stealth +5
- Damage Resistances Acid, Cold, Fire
- Senses blindsight 60ft., darkvision 120ft., passive Perception 17
- Languages Common, Draconic
- Proficiency Bonus +5
- Challenge 16(15000 xp)
Agile Swimmer While underwater, the dragon gains a +2 bonus to its AC and does not provoke attacks of opportunity while underwater. Additionally, if it fails a Dexterity saving throw while underwater, it takes half damage and none on a success.
Amphibious The dragon can breathe in air and in water
Draconic Essence When the dragon deals acid or cold damage, it can ignore resistance and immunity.
Dragon Scale The dragon has advantage on saving throws against spells and magical effects. On a successful saving throw, the dragon takes no damage at all
Frightful Presence Any creature hostile to the dragon that starts its turn within 20 feet of the dragon must make a DC 17 Wisdom saving throw, unless the dragon is incapacitated. On a failed save, the creature is frightened until the start of its next turn. If a creature's saving throw is successful, the creature is immune to the dragon's Frightful Presence for the next 24 hours.
Legendary Resistance (3/Day) If the dragon fails a saving throw, it can choose to succeed instead. Upon using this feature, the dragon can reroll a d6. Upon rolling a 5-6, it regains its Brine Breath.
Powerful Swimmer The dragon can swim through difficult terrain caused by strong tides without having to make ability checks or expend additional movement.
Actions
Multiattack. The dragon can make four attacks, one with its bite, two with its claws, and one with its tail.
Bite. Melee Weapon Attack: +12 to hit, 10ft., one target. Hit: 18(2d10+7) piercing damage + 9(2d8) cold damage.
Claw. Melee Weapon Attack: +12 to hit, 5ft., one target. Hit: 14(3d4+7) slashing damage.
Tail. Melee Weapon Attack: +12 to hit, 10ft., one target. Hit: 19(2d10+7) bludgeoning damage. On a hit, the target must succeed a DC 20 Strength saving throw or be knocked prone.
Brine Breath(Recharge 5-6). The dragon exhales a torrent of brine in a 60ft. cone originating from the dragon. Creatures within range must succeed a DC 20 Dexterity saving throw. On a failed saving throw, creatures take 23(5d8) acid damage + 23(5d8) fire damage and half as much on a success. Underwater creatures have disadvantage on this saving throw. This attack does not deal half damage while underwater
Bonus Actions
Wing Attack The dragon can force all creatures within 10ft. of it to make a DC 20 Dexterity saving throw. On a failed saving throw, the target is pushed back 10ft. and knocked prone. The dragon can fly or swim up to half its movement speed upon using this feature.
Aquatic Camouflage While underwater, the dragon can use its bonus action to Hide
Deep Dive While underwater, the dragon can use its bonus action to Dash
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.
Wing Attack The dragon can use its Wing Attack feature
Attack(Costs 2 actions) The dragon can make its choice of a bite or tail attack
Inhale(Costs 2 actions) The dragon can roll a d6. Upon rolling a 5-6, the dragon regains its brine breath.
Resilience(Costs 3 actions) The dragon can end one spell or status effect on itself.
Lair Actions
On initiative count 20 (losing initiative ties), the dragon takes a lair action to cause one of the following effects; the dragon can’t use the same effect two rounds in a row:
- Strong currents surge through the dragon's lair forcing each creature within 60ft. of the dragon to make a DC 20 Strength saving throw or be pushed back 60ft. On a success, creature are only pushed back 10ft.
- A swirling vortex appearing as a 10ft. wide and 60ft. tall column centered around a spot the dragon can see within 60ft until the dragon dies or uses this ability again. When a creature enters the vortex for the first time on its turn or starts its turn there, it takes 18(4d8) bludgeoning damage and is restrained until the start of its next turn.
- The water in the dragon's lair begins to grow incredibly cold or caustic. Creatures in a 20ft. cube around a spot that the dragon can see within 60ft. of it must succeed a DC 17 Constitution saving throw or take 23(5d8) acid or cold damage (the dragon's choice)
Regional Effects
The region containing a legendary sea dragon’s lair is warped by the dragon’s magic, which creates one or more of the following effects:
The dragon can alter weather at will in a 6 mile radius centered on its lair. The effect is identical to the control weather spell
Water within 1 mile of the dragon's lair become supernaturally turbulent and is considered to be difficult terrain.
The dragon can caus ehte surrounding waters within 1 mile of its lair to become supernaturally cold reaching 40 degrees Fahrenheit.
When the dragon dies, all of these regional effects immediately fade
Sea Dragons
Sea dragons are an aquatic variant of dragons that claim the ocean of their domains. Despite residing primarily within the water, sea dragons seek to maintain constant contact with the surface world. The amber of this relationship can vary depending on the individual as some serve as guardians protecting the surface world from other underwater threats or cruel overlords of their aquatic territories demanding tribute of those in water.
Sea Dragon Appearance
Sea dragons are quite easy to recognize due to their glittering scales that scintillating with various shades of green and blue. Although most sea dragons share the same color scheme, they have been known to develop various characteristics resembling their environment. For example, coastal sea dragons may have bony protrusions that resemble corals while sea dragons living deep within trenches may sport bioluminescent scales.
Combat Tactics
Sea dragons are incredibly effective fighters while underwater. Their movements are extremely graceful as if they see flying underwater and can easily outmaneuver other underwater creatures such as dragon turtles and kraken. If possible, the sea dragon will attempt to use this to its advantage, especially against terrestrial opponents. However, their greatest advantage is their versatility. Despite their aquatic nature, they are proficient fighters on the land as well as the air.