Massive serpentine creatures that swim through ice as easily as fish swim through water. Ice wyrms are native to the Pale Peaks and the frozen wastes beyond, where the cold runs deep enough to soak into the ground itself, and they emerge occasionally to hunt in the warmer north. They are not dragons. They lack wings, breath weapons, and any sign of intelligence. Their size and lethality make the distinction academic to anyone caught in their path.
An ice wyrm is not a flesh animal wearing a coat of ice. It is ice. The scales, the teeth, the long muscle of the body are Pelus-ice worked into the shape of a living thing, born and grown and fed in the frozen wastes the way any animal is, but made of the water plane's own cold substance rather than blood and bone. A living creature is held together by a soul, a shadow, and a spirit. The wyrm carries little or none of that ordinary set. What moves it is the cold-Kethic pooled in the deep ice where it was spawned, drawn up into a wyrm-shaped body that hunts and grows and dies like an animal while being, underneath, a piece of the water plane on the move. An elemental knight is the same kind of thing built on purpose, a fragment of a plane sealed into a coherent shape. The wyrm is the wild version that no one made.
Appearance
Ice wyrms range from twenty feet to over a hundred feet in length, their bodies roughly cylindrical and tapering toward the tail. The hide is a sheath of interlocking scales of clear blue-white ice, cold to the touch and faintly translucent. The scales shift and flow as the wyrm moves, keeping their flexibility despite being frozen solid, because they are not frozen flesh but the wyrm's own substance holding whatever shape the wyrm gives it.
The head is wedge-shaped, with a mouth that unhinges to swallow prey far larger than the head's apparent capacity. The teeth are crystalline ice and constantly regrow; a broken tooth falls away and a new one forms within hours, the way a crack in deep glacier closes over. The eyes are small, dark, and largely vestigial. Ice wyrms hunt by vibration.
No one has watched an ice wyrm breed. The Frostwatch has logged individuals across the full range of sizes but never a juvenile small enough to suggest recent hatching. Where new wyrms come from is not known, though the wastes where the cold-Kethic pools deepest are the obvious place to look.
Ice Swimming
Ice wyrms move through frozen water as though it were open sea, leaving tunnels that close and refreeze behind them within minutes. There is no mystery to how. The wyrm is Pelus-ice, and so is the glacier it swims through. They are the same locked element, and between like and like there is no boundary to cross. The wyrm parts the ice ahead of it and lets it close behind the way a fish parts water, because to the wyrm the ice is not solid at all. It is simply more of what the wyrm is made of.
An ice wyrm can travel through glacier ice, frozen sea, permafrost, and frozen soil where the ground is cold enough to hold the ice together. It cannot pass through liquid water, where it has nothing solid to swim and sinks, and the warmer water begins to melt it apart. It cannot pass through unfrozen earth, which is not its substance at all. Liquid water is the wrong state of its own element and gives no purchase; bare soil gives nothing. This is what pins the wyrm to permanently frozen country and keeps it, under ordinary conditions, south in the Pale Peaks.
When an ice wyrm travels through ice, the surface shows only a faint ripple, easy to miss unless you know the sign. Experienced Frostwatch observers track wyrm movement by these ripples, but the warning is usually a matter of seconds rather than minutes.
Hunting Behavior
Ice wyrms hunt by vibration. They sense movement through ice and frozen ground, homing on footsteps, heartbeats, and any other rhythmic disturbance. A person standing still on the ice is nearly invisible to a wyrm. A person walking is a beacon, and a person running is worse.
The attack pattern is consistent. The wyrm surfaces directly beneath or beside its target and strikes before the victim can react. Its crystalline teeth freeze flesh on contact, and its bulk can shatter a structure or flip a small boat. A successful strike is usually fatal; the wyrm swallows what it catches and submerges before any organized response is possible.
Ice wyrms are not intelligent in any meaningful sense. They set no ambushes, do not coordinate with one another, and show no problem-solving. They are predators running on instinct, and their instinct is very good at what it does.
Territory
Ice wyrms are native to the deep glaciers of the Pale Peaks and the polar waste beyond. Under ordinary conditions they do not venture north of the peaks. The ice is not thick enough, the ground is not frozen deep enough, and they cannot cross the Shrapnel Strait while it runs liquid.
During exceptionally cold winters, when the strait freezes solid and the northern ice sheet reaches south to meet it, ice wyrms sometimes follow their prey north. These incursions are rarer than frostwalker crossings and far more destructive when they happen. A single large wyrm can gut a fishing village in minutes.
The Frostwatch reckons perhaps two dozen ice wyrms range the Pale Peaks region at any time, from small ones of twenty or thirty feet to enormous specimens approaching a hundred. The polar waste beyond presumably holds more, but no one has survived there long enough to count them.
The Fengruk Response
Azanfrain's defenses against ice wyrms differ from their frostwalker protocols.
Vibration dampening is the primary defense. The fortress and its approaches use specially built floors and platforms that absorb footfall rather than transmit it through the ice. Guards learn to move slowly, step softly, and avoid the rhythms a wyrm might catch.
Detection stakes are driven into the ice at regular intervals around the fortress. The stakes carry vibration upward, and a wyrm passing nearby sets them humming audibly. The system gives early warning but little precision; you know something is coming, not where exactly.
Harpoon emplacements line the fortress walls, loaded with barbed projectiles meant to anchor in wyrm-hide. The goal is to pin it above the surface long enough for concentrated fire; killing it outright takes more sustained damage than harpoons can deliver. An immobilized wyrm can be destroyed. A submerged one cannot.
Bait stations stand at a safe distance from the fortress, platforms that generate deliberate vibration to draw wyrms away from defended ground. The stations are automated and expendable; when a wyrm surfaces to attack one, observers mark its location and route.
Combat
Fighting an ice wyrm is an exercise in preparation and opportunity. Its ice-swimming means it controls the timing of the engagement. It surfaces when it chooses, strikes, and submerges before retaliation is possible. The Frostwatch response is built around denying it that exit.
Anchoring is essential. Harpoons, chains, anything that stops the wyrm from submerging turns an ambush predator into a target that has to stay and take the answer. An anchored wyrm thrashes hard but can be worn down by sustained attack.
Fire does the work once the wyrm is held. The ice-scales shrug off cutting weapons but give way to heat. Alchemical fire and thermal lances can destroy an anchored wyrm in minutes.
Avoidance is still the preferred tactic. The Frostwatch does not hunt ice wyrms. They contain them, redirect them, and destroy them only when they must. Every engagement risks lives, and a wyrm threatens nothing that stays off the ice.
When a wyrm dies
An ice wyrm dies like an animal, but it does not leave a carcass the way an animal does. What animated it was never a soul and a shadow paired into a life. It was cold-Kethic, the living element of the water plane, drawn up into a wyrm-shaped body. When that body is broken past holding together, the cold drains out of it and runs back down into Pelus, the plane it was a piece of all along. There is no soul to climb to the Astral and no shadow to sink to Malstaris, because the wyrm carried neither. There is no name to fall off a spirit, because there was no spirit in it to name. The wyrm has no road out of life to take, only the long sinking-home of the cold into the element it was made from.
This is what sets the wyrm apart from the other cold-touched things of the Pale Peaks, all of which leave something behind. A frostwalker is a life-pair compromised by cold; break it and it locks and stills, but the wrongness stays put in the frozen flesh where it fell. Further south the same fault in the strand-set runs other ways. The cinderbound of the burned country leave a patch of fixed, fuelless heat where they go down, a haunt that can hold to a doorway for a generation. The galebound scatter thin onto the wind and are slow to fully leave. The hourbound never rejoin the world's clock at all. Each of those was once alive and kept enough of a strand-set to die badly and linger. The wyrm was never alive in that sense and has no strand-set to fail. It does not die badly or well. It simply stops being a wyrm and goes back to being water.
What is left on the ice is not the wyrm. As a wyrm's scales age they harden, and the cold-Kethic that once moved them settles and goes still, so that the matter of the old body is ordinary ice by the time the wyrm dies, holding a faint residue of the cold that pooled in it but none of the animation. When the wyrm dissolves, that inert ice is left lying where the body fell, blue-white and frozen and going nowhere. It is not a remnant the way the southern haunts are remnants. Nothing in it hunts or hungers. It is only frozen water now, and the Frostwatch harvests it. The scales stay frozen in any weather, close over small cracks on their own from the cold still in them, and insulate better than anything the Watch can make by hand, so they go into cold-weather gear and traders pay well for intact pieces. The wyrm that wore them has gone back to Pelus.
Ecology
Ice wyrms eat anything warm-blooded they can catch: seals, polar bears, caribou, people. They do not seem to need food often, and a large wyrm can apparently go months between meals, which may be why they are scarce. The Pale Peaks could not feed many apex predators of this size.
They are solitary. The Frostwatch has never seen ice wyrms travel together or coordinate. When several appear in the same area, they ignore one another completely, neither cooperating nor competing.
How ice wyrms and frostwalkers relate is not clear. They do not interact. A wyrm gives no attack to a frostwalker, which has no vibration signature and no body heat, and a frostwalker ignores a wyrm, which has no heat to put out. Both are cold-touched, but not in the same way. The wyrm is the cold given a body of its own; the frostwalker is the cold lodged in a body that was someone else's first. Whether they share any deeper origin, or merely keep to the same frozen ground, is unknown.
Hooks
The Deep One: An ice wyrm of unprecedented size, estimated at over two hundred feet, has been spotted in the deep glaciers of the Pale Peaks. It has not approached Azanfrain, but its presence suggests something in the wyrm ecology has changed. The Frostwatch wants to know what.
The Breeding Ground: A Frostwatch scholar is convinced the wyrms must come from somewhere, and that finding the place might give the Watch leverage against them, or reveal something important about the deep wastes. Gondurak is reluctantly weighing an expedition.
The Frozen Ship: A trading vessel was found frozen into the strait ice, its crew dead and partly eaten. The attack pattern points to an ice wyrm, but the ship was in water that should have been too warm for one. Something brought the cold with it.
The Tame Wyrm: Rumors persist of a Fengruk exile in the Pale Peaks who has somehow tamed a small ice wyrm and uses it as a mount or guard beast. The Council dismisses this as impossible. Several merchants swear they have seen it.