Doug Wagner 
Beware the Eye of Odin [PDF ebook] 

Helgi, the prince of a Viking village, has stumbled upon the cursed Eye of Odin. If he doesn’t return it to its rightful owner by the new moon, he will die an agonizing death of boils and decay. By his side are Stigr, a one-armed warrior past his prime, and Kadlin, a female warrior convinced she’s a Valkyrie. Their only path will take them through the treacherous lands of the Hundrafolk, Trolls, and Earthen Smiths. Collects BEWARE THE EYE OF ODIN #1-4