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Arcane Leviathan

Gargantuan · Construct · CR 16 · Unaligned

Source. Tome of Beasts 3

17 (natural armor)

279 (18d20+90)

Ability Scores

Core attributes and their modifiers.

STR

DEX

-3

CON

INT

-3

WIS

CHA

-1

Overview

Category Monsters

Size Gargantuan

Type Construct

Alignment Unaligned

XP 15000

Initiative Bonus -3

Movement

Walk 10 ft (3 m)

Swim 60 ft (18.3 m)

Climb 5 ft (1.5 m)

Crawl 5 ft (1.5 m)

Senses

Truesight 120 ft (36.6 m)

Passive Perception 13

Saving Throws

Strength +1 Constitution +1 Intelligence +2 Wisdom +8 Charisma +4

Skills

Perception +3

Languages

understands creator's languages but can't speak

Resistances & Immunities

Damage Immunities

lightning, poison, psychic

Damage Resistances

acid, thunder; nonmagic B/P/S attacks

Condition Immunities

blinded, charmed, deafened, exhaustion, frightened, paralyzed, petrified, poisoned

Traits

Construct Nature

Doesn’t require air food drink or sleep.

Impregnable

If subjected to an effect that allows it to make a save to take only half damage it instead takes no damage if it succeeds on the save and only half damage if it fails.

Siege Monster

Double damage to objects/structures.

Bonus Actions

Arcane Barrage

Sends arcane energy toward a creature it can see within 120' of it. Target begins to glow with arcane energy and at end of target's next turn: 35 (10d6) radiant (DC 19 Con half). Damage is divided evenly between target and all creatures within 10 ft. of it except leviathan.

About Arcane Leviathan

Arcane Leviathan is a gargantuan construct with a Challenge Rating of 16. It has a unaligned alignment.

In combat, this creature maintains an Armor Class of 17 and possesses 279 hit points (derived from 18d20+90).

Arcane Leviathan has communication capabilities including understands creator's languages but can't speak. This allows it to interact verbally with various creatures and characters.

GM Tips: Using Arcane Leviathan

1 tips available

When using Arcane Leviathan in your D&D 5e campaign, consider these tactical approaches:

Aquatic Combat: This creature can swim at 60 ft. It has advantage in water environments. Consider fighting on land or using water-based spells against it.

Player Guide: Facing Arcane Leviathan

1 strategies available

When your party encounters this creature, keep these strategies in mind:

Aquatic Combat Defense: This creature can swim at 60 ft! It has advantage in water. Fight on land if possible. Use 'Control Water' or drain water sources to limit its mobility.

Encounter Building Calculator

Standard Party Encounter (4-5 characters):

This creature is a medium encounter for a party of 4 characters of level 16.

Solo Encounter:

A single character of level 20 (up to level 20) can face this creature in a medium to hard encounter.

Experience Point Thresholds:

Medium: 27,200 XP
Hard: 40,800 XP
Deadly: 54,400 XP

Based on D&D 5e Dungeon Master's Guide encounter building guidelines. CR roughly equals party level for medium encounters.

Frequently Asked Questions

What is the challenge rating of Arcane Leviathan?: Arcane Leviathan has a Challenge Rating of 16, making it appropriate for parties of level 16.0.
What type of creature is Arcane Leviathan?: Arcane Leviathan is a Gargantuan Construct, which affects how certain spells and abilities interact with it.
What languages does Arcane Leviathan speak?: Arcane Leviathan can communicate in understands creator's languages but can't speak.