The Viking Mythos project continues to putter along.
On the left we have a troll tooth used as a protective charm. To the right a selection of wooden needles used for putting down Druagr, Viking undead. I'll add some iron nails to the set when I find some that have the right length and don't look machine made.
I suspect a Norse cultist would have few qualms about trafficking with the undead, but it's always wise to have a bit of leverage. "Do not call up any that you can not put down," as Lovecraft points out in "The Case of Charles Dexter Ward". The sagas have various portrayals of reanimated corpses, but driving needles into their feet appears repeatedly as a means of stilling their spirits, or at least preventing them from walking.