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Leviathan of the Sacred Deep

Gargantuan Monstrosity (titan), Neutral Evil


Armor Class 18 (natural armor)

Hit Points 231 (14d20+84)

Speed 30 ft. swim 60 ft.

STR 24 (+7)
DEX 10 (+0)
CON 22 (+6)
INT 8 (-1)
WIS 14 (+2)
CHA 6 (-2)

Saving Throws Con +10, Wis +6

Skills Athletics +8, Perception +6

Damage Immunities poison

Senses darkvision 120 ft., passive Perception 16

Languages Common, Aquan

Challenge 12 (8,400 XP) Proficiency Bonus +4


Legendary Resistance (3/Day). If the leviathan fails a saving throw, it can choose to succeed instead.
Magic Resistance. The leviathan has advantage on saving throws against spells and other magical effects.
Amphibious. The leviathan can breathe air and water.
Ancient Awareness. The leviathan can sense the holy wards that hold the city in balance and can read lingering auras within 120 feet.

Actions

Multiattack. The leviathan makes three attacks: a Bite, a Tail Slap, and a Fin Slash.
Bite. Melee weapon Attack: +11 to hit, reach 5 ft., one target. Hit: 23 (2d12+10) piercing damage.
Tail Slap. Melee weapon Attack: +11 to hit, reach 15 ft., one target. Hit: 16 (2d8+7) bludgeoning damage. If the target is Medium or smaller, it must succeed on a DC 19 Strength saving throw or be knocked prone.
Fin Slash. Melee weapon Attack: +11 to hit, reach 5 ft., one target. Hit: 14 (2d6+7) slashing damage.
Tidal Breath (Recharge 5-6). The leviathan exhales a torrent of water in a 60-foot cone. Each creature in that area must make a DC 20 Dexterity saving throw, taking 54 (12d8) bludgeoning damage on a failed save, or half as much on a successful one.
Tremor of the Depths. The ground within 60 feet trembles as the city above resounds with running water. Each creature in that area must succeed on a DC 18 Dexterity saving throw or be knocked prone.

Legendary Actions

The leviathan can take 3 legendary actions, choosing from the options below. Only one legendary action can be used at a time and only at the end of another creature's turn. The creature regains spent legendary actions at the start of its turn.

Detect. The creature makes a Wisdom (Perception) check.
Tail Attack. The creature makes a tail attack.
Wake the Tides (Costs 2 Actions). A surge of water erupts from the leviathan in a 60-foot cone. Each creature in that area must succeed on a DC 19 Dexterity saving throw or be pushed 20 feet and knocked prone.

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Lore & Description

Appearance

A colossal leviathan lies in slumber beneath the radiant capital, its massive body curled around the foundations like a sleeping cathedral. Its scales shimmer like wet obsidian, etched with pale runes that glow with holy light whenever the city prays. The beast's presence is felt through the city below: water veins pulse as if the city's heartbeat; the wards above trap its breath, and the surface quivers with every dream that flows from its abyssal mind. When it dreams, the sea itself seems to rise, and walls of water shimmer above the skyline as if the deep is breathing. If awakened, the leviathan's tidal wrath could flood the capital and drown the mightiest temple, but its slumber also keeps some ancient danger at bay—the price of immortality for the city’s safety.

Behavior & Origins

Centuries ago, a creature from the deepest trench rose as protector and destroyer of a holy city. The priests bound it with a pact woven of prayers, iron, and a river of blessed water, sealing its maw beneath the foundation. The city sits atop a cavernous seabed where water runs like arteries; the leviathan sleeps within that seabed, its breath cooling the heat of the holy city’s suns. Now, rumors tell of sacrilege that wakes the leviathan’s anger: if the city loses faith, the wards begin to crack and the great beast will rise, bringing a flood that could rewrite history. The players may be asked to keep the leviathan sleeping, or to awaken it to protect the city from a greater threat, but they must weigh the cost: a sleeping god is not easily awakened, and the price of failing will be the death of many, if not all, of the city’s citizens.

Monster Image

Leviathan of the Sacred Deep

Generation Info

Original prompt:
"A leviathan sleeping beneath a holy capital."

Created: Feb 2, 2026
Modified: May 22, 2026

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