Gargantuan Elemental, Chaotic Evil
Armor Class 24
Hit Points 813 (55d20 + 200)
Speed 40 ft., Swim 280 ft.
STR
29 (+9)
DEX
27 (+8)
CON
30 (+10)
INT
2 (-4)
WIS
22 (+6)
CHA
17 (+3)
Saving Throws STR +17, DEX +16, CON +18, WIS +14, CHA +11
Skills Athletics +15, Perception +12
Damage Vulnerabilities Cold
Damage Resistances Bludgeoning, Piercing, and Slashing from Nonmagical Attacks
Damage Immunities Acid, Lightning, Poison, Thunder
Senses Darkvision 600 ft., Passive Perception 20
Languages Aquan
Challenge 26 (90,000 XP)
Proficiency Bonus +8
Traits

Legendary Resistance (4/Day). If the leviathan fails a saving throw, it can choose to succeed instead.

Partial Freeze. If the leviathan takes 50 cold damage or more during a single turn, the leviathan partially freezes; until the end of its next turn, its speeds are reduced to 20 feet, and it makes attack rolls with disadvantage.

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

Water Form. The leviathan can enter a hostile creature’s space and stop there. It can move through a space as narrow as 1 inch wide without squeezing.

Feed the Storm. The leviathan heals (8d12) Hp each turn as long as a storm billows above it. 

Actions

Multiattack. The leviathan makes one Slam attack and one Tail attack.

Slam. Melee Weapon Attack: +16 to hit, reach 30 ft., one target. Hit: 21 (4d12+ 12) bludgeoning damage plus 13 (4d12) lightning damage.

Tail. Melee Weapon Attack: +14 to hit, reach 120 ft., one target. Hit: 19 (4d10 + 12) bludgeoning damage plus 20 (6d6) lightning damage.

Tidal Wave (Recharge 6). The leviathan magically creates a wave of water that extends from a point it can see within 120 feet of itself. The wave is up to 250 feet long, up to 250 feet tall, and up to 50 feet wide. Each creature in the wave must make a DC 26 Strength saving throw. On a failed save, a creature takes 90 (14d12) bludgeoning damage and is knocked prone. On a successful save, a creature takes half as much damage and isn’t knocked prone. The water spreads out across the ground in all directions, extinguishing unprotected flames in its area and within 250 feet of it, and then it vanishes.

Bonus Actions

Belch of Storms. (Recharge 4-6).The leviathan can let off a belch of cataclysmic lightning power. Everything in a 90 ft come must make a DC 22 Con Save and take (8d8){"diceNotation":"8d8","rollType":"damage","rollAction":"Belch of Storms","rollDamageType":"lightning"}[/rollable] lightning damage., half as much on a success. They also take (6d8) {"diceNotation":"6d8","rollType":"damage","rollAction":"Belch of Storms","rollDamageType":"thunder"}[/rollable] thunder damage.

Reactions

Feast of the Storm. As a Reaction whenever you are dealt lightning damage you can absorb it for the full damage done adding it to your HP if you are below max. If the leviathan is at Max HP when you use this reaction it adds it to its Max HP increasing it permanently. 

Legendary Actions

The leviathan 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 leviathan regains spent legendary actions at the start of its turn.

Move. The leviathan moves up to its speed.

Slam (Costs 2 Actions). The leviathan makes one Slam attack.

Description

A leviathan is an immense creature that acts as a force of nature, dragging ships down to the ocean’s depths and washing away coastal settlements. When called forth, a leviathan arises from a large body of water and takes on the form of a gigantic serpent.

Usually found only on the Elemental Plane of Water, a leviathan sometimes swims through a portal to another world, where tritons, sea elves, and other aquatic folk attempt to contain it. Nihilistic cults have also been known to perform arduous rituals to summon a leviathan to a world, with the aim of using the creature to destroy coastal communities. Those cultists often consider it a blessing to drown themselves in the elemental’s waters.

 Urutakavor the Waking Sea Storm is a colossal storm leviathan sealed away by an ancient tribe within the Sea of Fallen Stars. Sealed away by a Kraken feeding it to enormous size to keep a permanently open portal to the Primordial Plane of Water. This beast wants nothing more than to devour all electrical energy it can touch and release it in monstrous jolts of arcane power. The more it lies in the Material Plane eating its storms the larger it gets potentially able to take all energy it touches. It is considered a glutton of the leviathans within the Primordial Plane of Water.

Habitat: CoastalUnderwater

CaptnGnomie

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