Escaped Trilloch

From Expedition to Castle Ravenloft, a trilloch seeped through the gaps in the planar fabrics caused by Khyristrix' experiments in the Devil's Garden. It was the subject of experimentation for a time but escaped and now lingers in Castle Ravenloft. If it encounters the player characters, it will invisibly follow them and use its abilities to feed off of their negative emotions and perhaps even life energy.