Name: barrow wight
Difficulty: 7
Base level: 3
Base experience: 93
Speed: 12
Base AC: 5
Base MR: 5
Alignment: -3
Frequency: Very rare
Genocidable: Yes
    Claw: 1d4
    Random magic spell with nominal damage of (level/3+1)d6
    Projectile as weapon, or if in range, uses melee weapon for 0d0
Weight: 1200
Nutritional value: 0 (but leaves no corpse)
Size: medium
Resistances: cold, sleep, poison
Resistances conveyed by eating: None

Due to its unusual body chemistry, A barrow wight has no need to breathe. It is humanoid.

When he came to himself again, for a moment he could recall nothing except a sense of dread. 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. He dared not move, but lay as he found himself: flat on his back upon a cold stone with his hands on his breast.
The Fellowship of the Ring, by J.R.R. Tolkien