Black Pudding Cup

Originally used as torture devices by drow, black pudding cups are a small and weakened version of their former selves. Still capable of eating through solid materials, these tiny blobs work at a fraction of their natural rate, allowing them to be
handled briefly under the right conditions. The few that are kept as pets are concealed in tiny stone or glass cases: the two materials they are unable to eat. Insatiable Hunger. Albeit shadows of their former selves, their hunger remains beyond measure. Their natural urge to dissolve warm flesh makes them a useful tool in unspeakable
interrogations. Dwellers of the world below often create devices that allow pudding cups to enjoy a feast of warm flesh until their victims agree to cooperate.
Adapted Servants. Pudding cups, due to their diminutive state, act compliant to those who are too large to consume. Fed well, or commanded by fire, they can form an almost
symbiotic relationship with a creature. Their natural habits will shift to cooperate with an arcane master, as long as their master leads them to food. However, unattended or solitary black pudding cups will seek to consume anything nearby, while searching for a larger mass to join again.