- Titles: Hrimkonungr (an old Saxa term meaning “ Ice King”), Blizzard Roar, the White King, the Eternal Winter, Frost Lord.
- Aspects: Cold, ice, winter, blizzards, icy realms.
- Symbol: Hellfrost dragonhead.
- Priesthood: Breath of Winter (priests); Talons of Winter (paladins).
- Herald: A half-frost giant, half-Hellfrost dragon.
- Holy Day: Any day the temperature is below freezing. The first day of Fogmonan and last day of Frostmonan are high holy days.
- Duties: To expand the Hellfrost, to destroy servants of fire and heat.
- (Minor) lighting a fire, deliberately warming oneself by a fire, eating cooked food more than once a week;
- (Major) slaying any creature with Resistance or Immunity to cold except in self-defense, living in the Hearthlands for more than half a year without permission of a superior;
- (Mortal) slaying a Hellfrost dragon, working against the Fimbulvintr.
- Signature Power: Entangle.
- Powers: Armor, aura, barrier, beast friend (creatures with Resistance or Immunity to cold only), bladebreaker, bolt, bridge, burrow, burst, champion of the faith, deflection, detect/conceal, dispel, elemental form (coldfire, ice, or slush only), elemental manipulation (not fire), energy immunity (cold, coldfire, heat, fire, or ice only), environmental protection (cold only), fatigue, fear, fly, glyph, heat mask, light, obscure, prolonged blast, sanctuary, sluggish reflexes, smite, sphere of might, storm, stun, summon demon (ice only), summon elemental (coldfire, ice, or slush only), summon herald, voice on the wind, wilderness step (ice or snow only).
- Trappings: Spellcasters must take a cold, coldfire, or ice trapping where appropriate. They may never use a fire or heat trapping.
To most folk, the Hellfrost is a natural realm of ice and snow. To the followers of Thrym, the Hellfrost is a living embodiment of their god’s awesome power, and his desire to crush the world beneath a vast sheet of ice. Thrym seeks nothing more than to bring about the Fimbulvintr— an age of endless blizzards, a total ice age for the world of mortals.
Although most often worshipped by evil races such as snow orcs and frost giants, he actually cares little for good or evil, as these are simply moral choices assigned to a culture by its own members. Most hrimwisards pay him lip service, if only because their spells are more potent in his frigid realm.
Thrym is most often portrayed as a Hellfrost dragon, the living embodiment of the power of the Hellfrost, though he also takes the form of a colossal frost giant. All inhabitants of the Hellfrost view Hellfrost dragons as his offspring (much to the chagrin of the frost giants, who think they should be his chosen) and venerate them accordingly. Naturally, most Hellfrost dragons worship Thrym.
Temples to the Frost Lord are usually underground, away from the eyes of fire-loving creatures. Decorated with white dragon teeth and scales (sometimes donated freely), and usually always below freezing, followers conduct rituals to weaken the sun, their most hated foe. His clerics are expected to promote the Fimbulvintr in any way they can, be that through use of their spells, killing spellcasters with knowledge of fire, destroying relics with fire powers, or aiding frost giants and white dragons in their individual aims.
Worship of Thrym is usually conducted outdoors in the snow and biting winds. Worshippers scream prayers into the howling winds, while stripping off their clothes to expose their mortal flesh to Thrym’s frigid touch. Whenever possible, clergy sacrifice clerics of Kenaz and Sigel and fire elementalists to their god, knowing that their death provides him with renewed vigor.