b'Thuellai \n'b'  Huge   elemental ,  chaotic neutral  \n'b'  Armor Class  17  Hit Points  161 (14d12 + 70)  Speed  0 ft., fly 100 ft. (hover)\n'b' STATS STR: 22 (+6) DEX:  24 (+7)  CON:  20 (+5)  INT:  10 (+0)  WIS:  11 (+0)  CHA:  14 (+2)  \n'b'\n'b'\n'b'\n'b'\n'b'\n'b'\n'b'  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 \n'b' SPECIAL TRAITS \n'b'\n'b'  Chilling Presence . At the start of each of the thuellai\xe2\x80\x99s 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. \n'b'  Elemental Nature . The thuellai doesn\xe2\x80\x99t require air, food, drink, or sleep. \n'b'  Snowsight . The thuellai can see through areas obscured by snowfall, sleet, rain, and other wintry precipitation without penalty. \n'b'\n'b' ACTIONS \n'b'\n'b'  Multiattack . The thuellai makes three Icy Claw attacks. \n'b'  Icy Claw .  Melee Weapon Attack : +10 to hit, reach 10 ft., one target.  Hit : 15 (2d8 + 6) slashing damage plus 10 (3d6) cold damage. \n'b'  Freezing Breath (Recharge 5\xe2\x80\x936) . 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. \n'b'\n'b' ABOUT \n'b' This raging cloud of animate mist and ice has icicle shards for eyes and claws. \n'b'  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. \n'b'  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\xe2\x80\x99s unpredictable nature. \n'b'  Immune to Steel . Northerners especially fear the thuellai because of their  resistance  to mundane steel, their terrifying howls, and their ability to cause madness.'