A natural mountain fortress, the Rift clearly pulled the Heimasborg from a frigid, mountainous realm. It is an intricate system of caverns, with several plateaus, alcoves, and natural “windows” looking out into the surrounding mountains. The many caves yield several entrances, with the most easily accessible being a narrow valley that lies in ominous shadow. Rare, ice-loving lichen give an intermittent, soft blue-green glow through the dark caverns; and the lights from the Tundra also offer some colored illumination.