Barrow - Wights
The Barrow - Wight, image by John Howe
Barrow Wights were evil spirits that inhabited the Barrow Downs, they may be relatives of the Ring Wraiths / Nazgul. In the Third Age of the sun, the Witch King of Agmar commanded the Barrow - Wights to enter. The Barrow - Wights weaknest was sunlight, they can be destroyed in the light.