There is a legend from the borders of Britton and Scotland of a vile Murder Goblin. "I must keep my cowl wet — 'tis your blood I'll get."
Beware the ruined castles of the Scottish border. Should you seek shelter within their crumbling walls, you risk encountering a Redcap (Powrie). This goblin is driven by a lethal necessity: it needs to soak its cap (cowl) in fresh blood to survive. If its cap dries out, it faces certain death. 
Weary travelers should be careful not to confuse a Redcap with those cute, helpful garden gnomes. In making that error you may not live to regret it... Happy Halloween!!