These are the giant critters that we all love to hate: a foot long or more, black as night, falling on you from the ceiling, with a poisonous bite. If you are bitten, save vs. poison or be delirious for a week: move or crawl at half speed and do nothing else. You can barely see, much less talk. If you are attacked, you are helpless.
HD 1d4 AC 7 poison NM MV 6 ML 5 XP 6