Uncommon N Huge Beast
Senses Perception +14; darkvision, tremorsense (imprecise) 60 feet
Languages Jotun (can't speak any language)
Skills Athletics +18, Stealth +13
Str +7, Dex +2, Con +5, Int -3, Wis +1, Cha -2
AC 25; Fort +18, Ref +15, Will +10
HP 120; Immunities cold, fire
Heat (aura, evocation, fire, primal) 5 feet. A creature that starts its turn in the aura takes 1d6 fire damage. Whenever the remorhaz takes damage from an enemy, this damage increases to 2d6 until the start of its next turn. Any creature that hits a remorhaz with an unarmed Strike takes 2d6 fire damage, and a weapon that hits a remorhaz takes 2d6 fire damage.
Speed 35 feet, burrow 30 feet
Melee jaws +18 (reach 15 feet), Damage 2d10+9 piercing plus Grab
Melee tail +18 (fire, reach 15 feet), Damage 1d10+3 bludgeoning plus 2d6 fire
Breath Weapon (evocation, fire, primal) The remorhaz unleashes a gout of flame that deals 8d6 fire damage in a 30-foot cone (DC 26 basic Reflex save). It can't use Breath Weapon again for 1d4 rounds.
Ice Tunneler A remorhaz can leave a tunnel when it burrows through ice or snow, and it usually does.
Swallow Whole Large, 2d8+5 bludgeoning plus 2d6 fire, Rupture 12
Thrash The remorhaz Strikes once with its jaws and once with its tail, each targeting a different creature. Each attack counts toward the remorhaz's multiple attack penalty, but the multiple attack penalty doesn't increase until after all the attacks have been made.
A remorhaz is an enormous arctic predator that resembles a multilegged insect with draconic features. This monster has chitinous plates and more than a score segmented legs, a multipartite maw, and winglike growths flanking its head. The most unusual aspect of the creature, however, is its internal heat, which burns with such intensity that it causes the armored plates on the creature's back to become superheated whenever the beast is agitated.
Remorhazes are carnivores. Their diet includes arctic animals such as elk, but a hungry remorhaz readily devours anything it can catch and kill. It commonly lurks beneath ice or snow and ambushes prey with a sudden upward strike. Many victims die before even knowing what attacked them.
Those who survive the worm's initial onslaught must face not only its deadly jaws, but also its hideously hot body. This heat can melt weapons, scorch armor, and burn flesh—all tactics the remorhaz uses to disable and defeat its foes. A remorhaz's internal fire allows it to burrow through ice and snow with ease. It leaves smooth tunnels in its wake as melted ice refreezes to leave the telltale signs of its passage.
Most people underestimate a remorhaz's intelligence, assuming it to be a mere animal. However, remorhazes are capable of learning languages. Frost giants in particular use this trait to form alliances with them. The giants provide food, protection, and shelter for the worm, and in return the remorhaz acts as a guard beast and helps the giants build fortresses and forge metal weapons. The giants also employ the worms as war beasts, using them to undermine enemy positions.