A wight is a more powerful counterpart to the barrow wight in SLASH'EM. With two drain life attacks, it can be deadly to a character without high magic cancellation or drain resistance. Luckily, they tend not to appear before the player has MC 3, and thus are not a huge threat, as MC 3 more or less renders their drain life attacks harmless.
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.