This raging cloud of animate mist and ice has icicle shards for eyes and claws.
Servants of the North Wind. These fast-flying creatures of air and ice were created by the lord of the north wind, Boreas, to be his heralds, assassins, and hunting hounds. They appear as a swirling blizzard, often blending in with snowstorms to surprise their victims.
Terrifying Blizzards. Thuellai love to engulf creatures in their blizzards, to lash buildings with ice and cold, and to trigger avalanches with their whirlwinds. They thrive on destruction and fear, and they share their master’s unpredictable nature.
Immune to Steel. Northerners especially fear the thuellai because of their resistance to mundane steel, their terrifying howls, and their ability to cause madness.
Thuellai
Huge Elemental, Chaotic NeutralArmor Class 17
Hit Points 161 (14d12 + 70)
Speed 0 ft., fly 100 ft. (hover)
| STR | DEX | CON | INT | WIS | CHA |
|---|---|---|---|---|---|
| 22 (+6) | 24 (+7) | 20 (+5) | 10 (+0) | 11 (+0) | 14 (+2) |
Saving Throws Int +4, Wis +4, Cha +6
Skills Perception +4
Damage Vulnerabilities fire
Damage Resistances lightning, thunder; bludgeoning, piercing, and slashing from nonmagical attacks
Damage Immunities poison
Condition Immunities exhaustion, grappled, paralyzed, petrified, poisoned, prone, restrained, unconscious
Senses darkvision 60 ft., passive Perception 14
Languages Common, Dwarvish, Primordial
Challenge 12 (8,400 XP)
Proficiency Bonus +4
Chilling Presence. At the start of each of the thuellai’s turns, each creature within 15 feet of it must succeed on a DC 17 Constitution saving throw or take 7 (2d6) cold damage. For each minute a creature spends within 15 feet of the thuellai, it must succeed on a DC 17 Constitution saving throw or suffer one level of exhaustion from cold exposure. Unprotected, nonmagical flames within 15 feet of the thuellai are extinguished. Any spells of 3rd level or lower that provide resistance to cold damage and that are within 15 feet of the thuellai immediately end. Water freezes if it remains within 15 feet of the thuellai for at least 1 minute.
Elemental Nature. The thuellai doesn’t require air, food, drink, or sleep.
Snowsight. The thuellai can see through areas obscured by snowfall, sleet, rain, and other wintry precipitation without penalty.
Actions
Multiattack. The thuellai makes three Icy Claw attacks.
Icy Claw. Melee Weapon Attack: +10 to hit, reach 10 ft., one target. Hit: 15 (2d8 + 6) slashing damage plus 10 (3d6) cold damage.
Freezing Breath (Recharge 5–6). The thuellai exhales an icy blast in a 60-foot cone. Each creature in the area must make a DC 17 Dexterity saving throw, taking 49 (14d6) cold damage on a failed save, or half as much damage on a successful one.