" Legend claimed Berserkers could move with such speed that they seemed invisible to the human eye until the moment they attacked. They possessed unnatural senses: the olfactory acuity of a wolf, the auditory sensitivity of a bat, the strength of twenty men, the penetrating eyesight of an eagle. The Berserkers had once been the most fearless and feared warriors ever to walk Scotland nearly seven hundred years ago. They had been Odin's elite Viking army. Legend claimed they could assume the shape of a wolf or a bear as easily as the shape of a man. And they were marked by a common feature-unholy blue eyes that glowed like banked coals. "

― Karen Marie Moning , To Tame a Highland Warrior (Highlander, #2)