Aboleth Cave

From publisher blurb: Aboleth Cave is a Fifth Edition plug-in adventure for four characters with an average party level (APL) of 11, 14, 17, or 20. This addon offers details for each level and makes adjustments accordingly. The adventures must go toe-to-toe with a diabolical aboleth, an ancient, aquatic creature of formidable alien intelligence. Not only will the creature challenge their fighting skills, but their sanity, too.this adventure.