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Trigger warning — this fiend description contains themes of stalking, so if you have concerns about content like that, I suggest you give this creature a miss
Fear Liath Sahkil
Am Fear Liath Mòr; Brocken Spectre; The Grey Man (CR 12); orophobia — fear of mountains, freezing, isolation
The fear liath is a manifestation of the fear of isolation, freezing to death, and being stalked by an elusive creature that may not even exist. These environmental sahkil appear as hazy grey shapes with features that remain eternally indistinct, and rough humanoid form that shift from moment to moment like mountain mist given malevolent consciousness. Standing at least twelve feet tall, they have extremely elongated arms and legs, and are able to move with alarming speed, dashing from fog bank to fog bank before melting into with the mist.
Graybeards believe that fear riath explain the common fears that have driven many a climber to flee in blind panic down mountainsides; terrors which can overwhelm even experienced planewalkers when they realize they are utterly alone in an environment that actively seeks to kill them.
The fear liath’s philosophy is that with their reliance on magic and technology, mortals have become dangerously disconnected from environmental threats. This makes them particularly vulnerable to the psychological effects of isolation that can impair their judgment, and the fear liath use this to instill terror. These insidious sahkil exploit the fact that loneliness amplifies fear responses, and they exude an aura that slows down the rate at which victims recover from being frightened. The ultimate goal of the fear liath is to gradually increase the level of terror felt by their prey, until they literally frighten themselves to death. And if their psychological tricks need some extra je ne sais quoi, they can also cause avalanches, ice storms and deadly illusions.
Planewalkers entering fear liath domains—particularly icy mountainous planes like Mungoth or Cania—should prepare for environments where every environmental hazard becomes supernaturally amplified. The sahkil’s aura of altitude sickness can rapidly reduce even healthy cutters to gasping, confused berks. These sahkils deliberately choose the most dangerous terrain—ravine edges, unstable glaciers, and deep snow fields—where their ability to summon avalanches can turn mountainsides into devastating weapons. Fear liath employ patient stalking techniques, following victims for hours or days while remaining just beyond clear sight, allowing themselves to be glimpsed from afar before suddenly teleporting to appear right beside their prey in terrifying proximity. Planewalkers should watch for warning signs including unexplained drops in air pressure that cause breathing difficulties, the sound of footsteps with unnaturally long strides, and an overwhelming sense of dread that compels victims toward cliff edges—fear liath will occasionally attempt to drive climbers to suicide by making them feel that jumping is preferable to continued stalking. The ultimate danger lies in the fear liath’s cooperation with rabatoks, which creates environments where both vertigo and environmental hostility combine to create a perfect storm of terror that can drive even experienced mountaineers to complete psychological breakdown.
Source and Stats: The Creature Codex [PF1e] here; inspired by the Scottish monster Am Fear Liath Mòr.
Other Sources: Jon Winter-Holt. Canonwatch: The sahkil are a fabulously horrid type of fiend from Pathfinder lore, who make a great addition to the Ethereal Plane and Planescape lore generally. The Creature Codex has done an awesome job of expanding the number of sahkil massively too, and I’ve included all their creations here. Organising the sahkil into three sub-types based on their hunting style was my idea, because the list was unwieldy and their names are (deliberately) hard to remember, and this splits them up into bite-sized chunks.