Avalanche Screamer

Ice shards scrape together as this creature moves on its many icicle-like legs. The ice making up much of its body parts to reveal several toothy maws, and a scream erupts from deep within the creature._
Primordial Beings. Avalanche screamers were apex predators when the world was younger and covered in ice. As the world thawed, avalanche screamers fled to mountain peaks and polar regions to hunt smaller prey. Avalanche screamer lairs contain a jumble of bones from their victims but have no other commonalities.
Devious Hunter. A versatile predator, the avalanche screamer can attack its prey from the ground beneath or from cliffs and trees above. It prefers to pick off its victims one at a time, grabbing stragglers at the back of a group and killing them before returning to the group. When it must face multiple foes simultaneously, it uses its scream to inflict harm on as many targets as possible. In unstable areas, the sound can cause avalanches, which the avalanche screamer rides out unscathed. It then uses its ability to detect vibrations to locate survivors, tunnel its way toward them, and devour them.
Summer Hibernation. Because avalanche screamers become lethargic and vulnerable in warmer temperatures, they hide themselves during the brief summers in their mountaintop and polar habitats. In preparation for their summer slumbers, they aggressively hunt prey, fattening themselves or stockpiling in their lairs. As a precaution against hunters that might follow them to their lairs, avalanche screamers often collect their food from miles away and tunnel through the ground to leave no tracks. Those who manage to track the creatures and hope to easily dispatch them while they are sluggish find avalanche screamers quickly shake their torpor to defend themselves.