The Ly Erg is a small Scottish faerie that can be found on lonely roadsides near water.
There is only one Ly Erg. He dresses like a soldier and can only be distinguished from a real one by his small size and his red right hand. His red hand is said to be the result of many years of bloodstains from those he has killed in combat.
It is reported that Ly Erg will stop his mark on a road or path (especially if it is near water) and challenge you with a raising of his red right hand. The best thing to do in this instance is to retreat, because if you allow him to engage you in combat you will die within a fortnight.