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Illhveli, Nauthveli

Gargantuan · Monstrosity · CR 16 · Chaotic Evil

Source. Tome of Beasts 2

18 (natural armor)

280 (16d20+112)

Ability Scores

Core attributes and their modifiers.

STR

+10

DEX

CON

INT

-2

WIS

CHA

Overview

Category Monsters

Size Gargantuan

Type Monstrosity

Alignment Chaotic Evil

XP 15000

Initiative Bonus +0

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

Darkvision 60 ft (18.3 m)

Passive Perception 17

Saving Throws

Strength +15 Constitution +12 Wisdom +7

Skills

Athletics +15 Perception +7

Languages

understands Common but can't speak

Resistances & Immunities

Damage Resistances

cold

Condition Immunities

frightened, prone

Traits

Hold Breath

The nauthveli can hold its breath for 1 hour.

Siege Monster

The nauthveli deals double damage to objects and structures.

Terror of the High Seas

The nauthveli is surrounded by a supernatural aura of dread. Each creature that starts its turn within 60 feet of the nauthveli must succeed on a DC 18 Wisdom saving throw or become frightened for 1 minute. A creature immersed in water has disadvantage on this saving throw. A frightened creature can repeat this 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 nauthveli’s Terror of the High Seas for the next 24 hours.

Actions

Bite

+15 to hit, reach 10 ft (3 m). Hit: 6d6+10 piercing damage.

Melee Weapon Attack: +15 to hit, reach 10 ft., one target. Hit: 31 (6d6 + 10) piercing damage. If the target is a creature, it is grappled (escape DC 18). Until this grapple ends, the target is restrained, and the nauthveli can't bite another target.

Multiattack

The nauthveli makes one bite attack and one tail attack.

Swallow

The nauthveli makes one bite attack against a Large or smaller creature it is grappling. If the attack hits, the target is also swallowed, and the grapple ends. While swallowed, the creature is blinded and restrained, it has total cover against attacks and other effects outside the nauthveli, and it takes 28 (8d6) acid damage at the start of each of the nauthveli's turns.

If the nauthveli takes 40 damage or more on a single turn from a creature inside it, the nauthveli must succeed on a DC 22 Constitution saving throw at the end of that turn or regurgitate all swallowed creatures, which fall prone in a space within 10 feet of the nauthveli. If the nauthveli dies, a swallowed creature is no longer restrained by it and can escape from the corpse using 15 feet of movement, exiting prone.

Tail

+15 to hit, reach 20 ft (6.1 m). Hit: 4d8+10 bludgeoning damage.

Melee Weapon Attack: +15 to hit, reach 20 ft., one target. Hit: 28 (4d8 + 10) bludgeoning damage.

Thunderous Bellow

Recharge 5–6

The nauthveli bellows in a 60-foot cone. Each creature in the area must make a DC 20 Dexterity saving throw. On a failure, a creature takes 54 (12d8) thunder damage and is pushed up to 15 feet away from the nauthveli and knocked prone. On a success, a creature takes half the damage and isn't pushed or knocked prone.

About Illhveli, Nauthveli

Illhveli, Nauthveli is a gargantuan monstrosity with a Challenge Rating of 16. It has a chaotic evil alignment.

In combat, this creature maintains an Armor Class of 18 and possesses 280 hit points (derived from 16d20+112).

Illhveli, Nauthveli has communication capabilities including understands Common but can't speak. This allows it to interact verbally with various creatures and characters.

GM Tips: Using Illhveli, Nauthveli

1 tips available

When using Illhveli, Nauthveli 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 Illhveli, Nauthveli

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 Illhveli, Nauthveli?: Illhveli, Nauthveli has a Challenge Rating of 16, making it appropriate for parties of level 16.0.
What type of creature is Illhveli, Nauthveli?: Illhveli, Nauthveli is a Gargantuan Monstrosity, which affects how certain spells and abilities interact with it.
What languages does Illhveli, Nauthveli speak?: Illhveli, Nauthveli can communicate in understands Common but can't speak.