The Leviathan

"Its scales are like rows of shields, and out of its mouth leap forth sparks of fire."
Job 41:1-30

The Leviathan is one of two mythic beasts who are prophesied to bookend the existence of creation itself. Neither the Behemoth nor the Leviathan are part of the created world, but instead exist as sleeping symbols of the destruction and chaos of a universe before God intervened. As creatures of another reality, they are neither male nor female; they are neither aligned to good nor to evil. They merely exist as forces of balance, destruction, and chaos. These mythic beasts were stilled during creation by the hand of God, but will one day awaken. Legend says that, at the time of new beginnings when it is accorded that the old world should pass away, the Leviathan and the Behemoth will do battle, and that their battle will crumble the cities of the earth to dust. Only when the battle is ended and both creatures are dead will the new earth be realized, out of the dust of the old.

Despite its reputation as an unstoppable force of destruction and chaos, the Leviathan currently lies dormant below the waves of the great sea. During the creation of the world, God stilled the Leviathan and the Behemoth, and they both now lie dormant, awaiting the day when they will be called upon again to destroy the world so that God can make all things new.

Gargantuan Monstrosity, unaligned

Armor Class 20

Hit Points 368

Speed 50 ft., Swim 90 ft.

STR	DEX	CON	INT	WIS	CHA
28 (+9)	20 (+5)	26 (+8)	4 (-3)	16 (+3)	10 (+0)

Saving Throws DEX +14, CHA +9

Damage Resistances Thunder

Damage Immunities Fire, Necrotic; bludgeoning, piercing, and slashing from nonmagical attacks

Condition Immunities Charmed, Frightened, Paralyzed, Poisoned

Senses Truesight 60 ft., Passive Perception 13

Challenge 27 (105,000 XP)

Features

Legendary Resistance (5/Day). If the Leviathan fails a saving throw, it can choose to succeed instead.

Magic Resistance. The Behemoth has advantage on saving throws against spells and other magical effects.

Amphibious. The Leviathan can breath air and water.

Freedom of Movement. The Leviathan ignores difficult terrain, and magical effects cannot reduce its speed or cause it to become restrained. It can spend 5 feet of movement to escape from nonmagical restraints or being grappled.

Apocalypse Monster. The Leviathan deals double damage to the natural world (Mountains, trees, rivers), and triple damage to objects not being worn or carried and structures.

Actions

Multiattack. The Leviathan can use its Frightful Presence. It then makes 4 attacks: one with its Bite, two with its claws and one with its Tail. It can use a Swallow attack instead of its bite attack.

Bite. Melee Weapon Attack: +18 to hit, reach 10 ft., one target. Hit: 54 (10d8+9) piercing damage. If the target is a creature, it is grappled (escape DC 19). Until the grapple ends, the target is restrained and the Leviathan cannot bite another target.

Claw. Melee Weapon Attack: +18 to hit, reach 10 ft., one target. Hit: 35 (4d12+9) slashing damage.

Swallow. The Leviathan makes a Bite attack against a Huge or smaller creature it is grappling. If the attack hits, the creature is swallowed, ending the grapple on it. While swallowed, the creature is blinded and restrained, it has total cover against attacks and other effects outside the Leviathan, and it takes 28 (8d6) acid damage at the start of each of the Leviathan's turns.

If the Leviathan takes 50 damage or more on a single turn from a creature inside it, the Leviathan must succeed on a DC 21 Constitution saving throw at the end of that turn or regurgitate all swallowed creatures, which fall prone in a space within 10 ft of the Leviathan. If the Leviathan dies, a swallowed creature is no longer restrained by it and can escape from the corpse by using 30 feet of movement, exiting prone.

Frightful Presence. Each creature within 120 feet of the Leviathan must succeed on a DC 20 Wisdom saving throw or become frightened for 1 minute. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. If a creature's saving throw is successful or the effect ends for it, the creature is immune to the Leviathan's Frightful Presence for the next 24 hours.

Breath Weapon (Recharge 5-6). The Leviathan exhales fire in a 120-foot cone. Each creature in that area must make a DC 25 Dexterity saving throw, taking 84 (24d6) fire damage on a failed save, or half as much damage on a successful one.

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 Leviathan regains spent Legendary Actions at the start of its turn.

Move. The Leviathan moves up to its speed without provoking opportunity attacks.

Lightning Storm (Costs 2 Actions). Dark clouds form in the sky and three bolts of lightning strike from above. Each bolt strikes a target the Leviathan can see within 120 feet A target must make a DC 21 Dexterity saving throw, taking 22 (4d10) lightning damage on a failed save, or half as much damage on a successful one.

Bible5e custom monster. Its specific traits supplement the current rules. See Using Bible5e Monsters.