Voidshade Leviathan

Armor Class 27 Natural

Hit Points 799 (30d20 + 199)

Speed 50 ft., burrow 30 ft.

STR

30 (+10)

DEX

11 (+0)

CON

28 (+9)

INT

14 (+2)

WIS

17 (+3)

CHA

13 (+1)

Saving Throws CON +34, WIS +23, CHA +19

Skills +14, +7

Damage Vulnerabilities Poison, Radiant

Damage Resistances Bludgeoning, Piercing, and Slashing from Nonmagical Attacks

Damage Immunities Necrotic, Psychic

Condition Immunities , , , , , , , ,

Senses 120ft, Passive Perception 24

Languages Common Understands but can't speak

Challenge 30 (155,000 XP)

Proficiency Bonus +9

Traits

Phantom Shroud: At the start of each of its turns, spectral shadows swirl in a 20-foot radius around the Leviathan. Creatures that start their turn in the area take 27 (6d8) necrotic damage and must succeed on a DC 22 Intelligence saving throw or have their movement halved until the end of their next turn.

Devour Essence: As a bonus action, the Leviathan drains magical energy from a spell or magic effect within 120 feet. The effect ends instantly, and the Leviathan regains 50 hit points. If it ends a spell of 7th level or higher, it regains 100 hit points instead.

Ethereal Jaunt: The Leviathan can shift partially into the Ethereal Plane and back as a bonus action, moving up to 60 feet without provoking opportunity attacks.

Legendary Resistance (3/Day): If the Leviathan fails a saving throw, it can choose to succeed instead.

Spellcasting: The Leviathan’s innate spellcasting ability is Wisdom (spell save DC 19). It can cast the following spells, requiring no material components:

At will: Darkness, Shadow Blade

3/day each: Blight, Finger of Death

1/day: Circle of Death

Actions

Multiattack: The Leviathan makes three attacks: two with its claws and one with its bite, and may follow with one Necrotic Roar if it hits at least one target.

Claw: Melee Weapon Attack: +17 to hit, reach 15 ft., one target. Hit: 42 (6d8 + 12) slashing damage.

Bite: Melee Weapon Attack: +17 to hit, reach 15 ft., one target. Hit: 58 (8d10 + 12) piercing damage. On a hit, target must succeed on a DC 22 Constitution saving throw or suffer an additional 27 (6d8) necrotic damage as phantom tendrils lash its soul.

Necrotic Roar: The Leviathan emits a bone-rattling roar in a 60-foot cone. Each creature in that area must make a DC 22 Wisdom saving throw, taking 72 (16d8) necrotic damage on a failed save, or half as much on a successful one.

Ghostly Swipe: The creature sweeps the ground in a 30-foot line. Each creature in that line must succeed on a DC 22 Dexterity saving throw or take 49 (9d10) necrotic damage and be pushed 15 feet prone.

Legendary Actions

Detect: The Leviathan makes a Wisdom (Perception) check.

Ghostly Slam: The Leviathan makes one claw attack against a creature within reach.

Necrotic Surge (Costs 2 Actions): Spectral tendrils lash out in a 30-foot radius around the Leviathan. Each creature there must succeed on a DC 22 Constitution saving throw or take 45 (10d8) necrotic damage, half on a success.

Description

Description: A towering behemoth whose flesh seems half-shadow, half-solid mass, its colossal form drips with necrotic ichor. Jagged scales ripple like living darkness, and sunken void-glowing eyes burn with malevolent intelligence. Every movement echoes like a death knell as ethereal tendrils writhe beneath its maw, exhaling a chill that warps life itself. The air around it crackles with phantom energy, and reality seems to fray with each thunderous step. This is no mere monster but a living cataclysm, bound by the rogue Shade’s phantom chains to rend the world asunder.

Lore: Once a rogue Tarrasque enslaved by phantom rogue Shade, this creature’s flesh was fused with Shadowfell energies. Rumored to be the final instrument in Shade’s plan to collapse the mortal realms into perpetual night, legends speak of armies turned to ash by its passage.

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