|“||Then suddenly he knew that he was imprisoned, caught hopelessly; he was in a barrow. A Barrow-wight had taken him, and he was probably already under the dreadful spells of the Barrow-wights about which whispered tales spoke.||”|
–The Fellowship of the Ring
Barrow-Downs Barrows are burial mounds found very commonly in the Barrow-downs. They are the tombs of petty kings, and are now inhabited by their spirits, which became evil after Sauron's power passed through this area.
Inside a barrow is a dome-shaped chamber of stone, cobblestone and brick, with a chest in the middle.
There is one treasure chest in the middle of the structure, in which you can find Barrow Blades, items made of iron or bronze, gold and silver nuggets, ingots and rings, coins and, rarely, even mithril.
If you try to open the chest in the middle of the Barrow, a Barrow-wight spawns and proceeds to try to kill you, so you must be very careful on all your crazy loot runs!