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Thuellai

Huge · Elemental · CR 10 · Chaotic Neutral

Source. Tome of Beasts

149 (13d12+65)

Ability Scores

Core attributes and their modifiers.

STR

DEX

CON

INT

WIS

CHA

Overview

Category Monsters

Size Huge

Type Elemental

Alignment Chaotic Neutral

XP 5900

Initiative Bonus +7

Movement

Fly 100 ft (30.5 m)

Hover Yes

Senses

Darkvision 60 ft (18.3 m)

Passive Perception 14

Saving Throws

Intelligence +4 Wisdom +4 Charisma +6

Skills

Perception +4

Languages

Common, Dwarvish, Primordial

Resistances & Immunities

Damage Immunities

poison

Damage Resistances

lightning, thunder; bludgeoning, piercing, and slashing from nonmagical attacks

Damage Vulnerabilities

fire

Condition Immunities

exhaustion, grappled, paralyzed, petrified, poisoned, prone, restrained, unconscious

Environments

Arctic or Tundra Caves Coast Desert Forest or Jungle Grassland or Plains Hills Laboratory Lake Mountain Ocean Ruins Sewer Shadowfell The Abyss Astral Plane Elysium Ethereal Plane Feywild Hell Material Plane Plane of Air Plane of Earth Plane of Fire Plane of Water Swamp or Marsh Temple Badlands Tomb Underworld Urban

Traits

Air Mastery

Airborne creatures have disadvantage on attack rolls against the thuellai.

Snow Vision

The thuellai see perfectly well in snowy conditions. It does not suffer Wisdom (Perception) penalties from snow, whiteout, or snow blindness.

Actions

Algid Aura

All creatures within 10 feet of a thuellai take 7 (2d6) cold damage at the beginning of the thuellai's turn. Spells or magical effects that protect against cold are affected as if by a dispel magic spell (the theullai's effective spellcasting bonus is +5) if a thuellai is within 20 feet of the target at the start of the theullai's turn, and nonmagical flames within 20 feet of the thuellai are extinguished at the start of its turn.

Blizzard

1/day

The thuellai creates an icy blizzard in the area around it. A 50-foot radius sphere surrounding the theullai fills with icy fog, whirling snow, and driving ice crystals. Vision is lightly obscured, and creatures have disadvantage on Wisdom (Perception) checks that rely on vision or hearing. The ground in the affected area becomes difficult terrain. The effect lasts for 10 minutes and moves with the theullai.

Claw

+10 to hit, reach 10 ft (3 m). Hit: 2d8 cold damage.

Melee Weapon Attack: +10 to hit, reach 10 ft., one target. Hit: 15 (2d8 + 6) slashing damage plus 26 (4d12) cold damage. If the target is wearing metal armor, it must make a successful DC 17 Constitution saving throw or gain one level of exhaustion.

Freezing Breath

Recharge 5–6

The thuellai exhales an icy blast in a 40-foot cone. Each target in the area takes 39 (6d12) cold damage, or half damage with a successful DC 17 Constitution saving throw.

Howl of the Maddening Wind

3/day

a thuellai's howl can cause creatures to temporarily lose their minds and even to attack themselves or their companions. Each target within 100 feet of the theullai and able to hear the howl must make a successful DC 14 Wisdom saving throw or roll 1d8 and consult the table below at the start of its next turn. An affected creature repeats the saving throw at the end of each of its turns; a success ends the effect on itself, but a failure means it must roll again on the table below at the start of its next turn.

1 - Act normally

2-4 - Do nothing but babble incoherently

5-6 - Do 1d8 damage + Str modifier to self with item in hand

7-8 - Attack nearest target; select randomly if more than one

Multiattack

The thuellai makes two claw attacks.

About Thuellai

Thuellai is a huge elemental with a Challenge Rating of 10. It has a chaotic neutral alignment.

In combat, this creature maintains an Armor Class of 17 and possesses 149 hit points (derived from 13d12+65).

Thuellai has communication capabilities including Common, Dwarvish, Primordial. This allows it to interact verbally with various creatures and characters.

GM Tips: Using Thuellai

2 tips available

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

Flight Control Strategy: Target flying creatures with spells like 'Hold Person', 'Web', or 'Grease' to ground them. Without flight restriction, they can escape melee range easily. Consider area denial spells below their flight altitude to force them into disadvantageous positions.
Cold Damage Strategy: Cold-based attacks can slow or freeze. Prepare 'Heat Metal' or fire spells as countermeasures. Ice terrain can be used to create difficult terrain for melee characters.

Player Guide: Facing Thuellai

2 strategies available

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

Counter Flight Advantage: This creature can fly! Use ranged attacks, reach weapons, or spells like 'Thunderwave' to push it away. Consider 'Gust of Wind' or 'Earthbind' to ground it. Melee characters need fly speed or flight magic to engage.
Cold Damage Protection: This creature deals cold damage! Get cold resistance or use fire spells. Avoid water surfaces - they can freeze and create difficult terrain. 'Heat Metal' can counter cold.

Encounter Building Calculator

Standard Party Encounter (4-5 characters):

This creature is a medium encounter for a party of 4 characters of level 10.

Solo Encounter:

A single character of level 13 (up to level 20) can face this creature in a medium to hard encounter.

Experience Point Thresholds:

Medium: 11,000 XP
Hard: 16,500 XP
Deadly: 22,000 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 Thuellai?: Thuellai has a Challenge Rating of 10, making it appropriate for parties of level 10.0.
What type of creature is Thuellai?: Thuellai is a Huge Elemental, which affects how certain spells and abilities interact with it.
What languages does Thuellai speak?: Thuellai can communicate in Common, Dwarvish, Primordial.