Claim: Ly Erg is a fairy in Scottish folklore associated with the Glenmore Forest (a remnant of the Caledonian Forest) who is dressed as a soldier.
Evidence: The Ly Erg is a fairy from Scottish folklore, particularly associated with the area in and around the Glenmore Forest, part of the present-day Cairngorms National Park. Glenmore Forest Park is a remnant of the Caledonian Forest near Aviemore in the Badenoch and Strathspey district of Highland, Scotland. It is dressed as a soldier, distinguishable from a real soldier only by its red right hand, said to be stained with the blood of its victims.