From the publisher (Dog Soul Publishing):
A setting for d20 fantasy, inspired by the myths and legends of Iceland.
Four portals lead the treacherous way to Niflheim, the demiplane of the departed, Hel's kingdom of undeath. Within its borders great beasts sit coiled in their lairs, undead writhe on sizzling shores, rivers hiss and crack as lava and ice combine, and trolls sit unmoving so long they become the mountains themselves. In Niflheim, a clutch of settlements cling together - as if for warmth - and dream of one day returning to the material plane...
Journey to the Demiplane of Fire and Ice - Niflheim, the realm of Hel. Based on the legends of the Norse and Iceland, Niflheim provides a dark diversion for GM's and pc's.
Monsters and creatures such as the Valkyrie, the Jotnar, Nidhogg and Gnauroq - challenging locations such as the Shore of Corpses, Helka Volcano, the Islands of Fire and Ice and the Hall of the Mountain King have been brought together in a land both rich with rewards and rife with danger.