Gargantuan Dragon, Unaligned
Armor Class 20 natural armor
Hit Points 350 (20d20 + 55)
Speed 40 ft., Swim 50 ft., Walk 40 ft.
STR
27 (+8)
DEX
20 (+5)
CON
25 (+7)
INT
29 (+9)
WIS
30 (+10)
CHA
24 (+7)
Saving Throws STR +15, CON +14, INT +16, WIS +17
Damage Immunities Cold, Lightning, Thunder; Bludgeoning, Piercing, and Slashing from Nonmagical Attacks
Senses Blindsight 120 ft, Darkvision 120 ft, Passive Perception 19
Languages Common, Draconic, Primordial
Challenge 21 (33,000 XP)
Proficiency Bonus +7
Traits

Amphibious. the sea dragon can breath air and water.

Spellcasting. The Adult sea dragon is a 6th-level spellcaster. Its spellcasting ability is wisdom (spell save DC 8, +2 to hit with spell attacks). The Adult sea dragon has following  spells prepared.

Cantrips (at will): frostbite, primal savagery, shape water, ray of frost, druidcraft.
1st level : absorb elements, chaos bolt, ice knife, create or destroy water, purify food and drink, animal friendship, speak with animals, arms of hadar.

2nd level : dragon's breath, snilloc's snowball swarm, animal messenger.

3rd level : tidal wave, wall of water, wall of sand, create food and water, water walk, conjure animals, water breathing, hunger of hadar.

4th level : elemental bane, watery sphere, control water, ice storm, evard's black tentacles, conjure minor elementals.

5th level : conjure elemental, cone of cold.

6th level : investiture of ice, otiluke's freezing sphere, wall of ice.

some adult sea dragons choose the path of sea storms witch gives them the following spells.

control winds, investiture of wind, maelstrom, storm sphere, steal wind strike, thunderclap, thunder step, zephyr strike, whirlwind, call lightning, chain lightning, control weather, gust of wind, gust, warding wind, lightning bolt, tsunami, wind wall, witch bolt.

Actions

Multiattack. the Adult sea dragon makes three attacks: one with its bite and two with its claws.

Bitemelee weapon attack : +9 to hit, reach 10 ft., one target. hit : 3d10 piercing damage.

Claw. melee weapon attack : +9 to hit, reach 5 ft., one target. hit : 4d6 slashing damage.

Tail. melee weapon attack : +9 to hit, reach 15 ft., one target. hit : 5d8 bludgeoning damage.

Tidal wave breath. the dragon exhales a torrent of deadly water in a 90 foot line that is 5 feet wide. each creature in that line must make a dex saving throw of 16 or higher taking 5d10 water damage on a failed save.

Frost breath. the dragon exhales an icy blast in a 60 foot cone. each creature in that area must make a con saving throw of 15 or higher taking 4d12 cold damage on a failed save.

Lightning breath. the dragon exhales lightning in a 90 foot line that is 5 feet wide. each creature in that line must make a dex saving throw of 16 or higher taking 5d8 lightning damage on a failed save.

Legendary Actions

the Adult sea dragon can take three legendary actions.

water spout. 30 feet two targets.  the dragon roars at a point in range and a water spout erupts targets must succeed on a dex saving throw if fail they take 5d6 water damage + 3d10 fire damage.

whirlpool. 20 feet three targets.  the dragon stares at a point in range and the targets must succeed on a dex saving throw if fail targets get prone in the whirlpool taking 6d12 bludgeoning damage.

Description

sea dragons tend to keep to their own kind but except for merfolk who they tolerate from time to time. they have pattern in wave designs on the under side of their wings and glowing patterns on their snout, arms, legs, and tails that help to see in deep trenches. and their scales color from to rich emerald green to deep indigo blue. 

Habitat: CoastalUnderwater

dragonfish850

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