From the Publisher:
They Willingly Walk In Darkness, That Hel Will Find No Rest
The merkstaves left their brethren and traveled under the mountains of Niflheim. Oathbound to Forseti, Baldr's son, they swore to guard the one portal through which Hel could escape her prison.
The Mikill Gata (Great Road) runs like an invisible artery through the mountains of Niflheim. Beginning close to the northeastern shore, where the sea is cold and teaming with life, the Mikill Gata runs past Loftur the Necromancer’s lair, past The Mountain King’s home, and past the watchpost of the great hawk Gnauroq. It then runs west until it reaches Soltinnbru, The Hungry Bridge, the cursed portal through which Hel can cross, if she pays a price.
A new supplement for Niflheim, The Mikill Gata contains information about the merkstaves and their animal companions, the fyldja, as well as gridded maps of key locations along the almost 1,000 mile long Road.