As another Lame Cherry exclusive in matter anti matter.
The warriors of the Vikings assembled a special guard, for kings and for battle. You have heard of the term berserker, and these men were identified by the skins of bear, wolf and boar. They were hamrammr, that is shapestrong in the language, they were shapeshifters who took on the likeness of the beast.
They were not to be near in battle, except among their own kind, as they were in a trance like state, in which they killed all in the frenzy.
The "tasters of blood" in this passage are thought to be ravens, which feasted on the slain.
The spiritual frenzy gave them skins of steel. These were the outlawed berserkers who gnawed their shields of iron with their teeth.