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Pathfinder 5: Sins of the Saviors
Rimeskull is a mountain on the western edge of the Kodar Mountains in Varisia. Located on the banks of Lake Stormunder, it gets it name from the vaguely skull-shaped carving visible from miles away. At its western base, just off the lake lies a ring of seven ten-foot-high stone heads, angled towards each other with their mouths open that are known as the Sihedron Circle. This Thassilonian ruin was recently discovered to be a magical entrance to the Runeforge.