A band of robbers has been besetting people on a major road of Plex, and the PCs have been asked to track them back to their hideout, put a stop to them, and return what they stole. Unfortunately, their base of operations is in an unconventional location that makes it difficult to assault them. They've established a stockade on a giant tongue emerging from a proportionally gigantic mouth of the living world, over which they have found a way to exercise control through a combination of magic and electrical prodding. When threatened, the bandits simply make the tongue withdraw into the mouth, which then closes around it. If they want to reach the bandits' base and take back their ill-gotten gains, the PCs are going to have to find a way to force their entry into the mouth... and then they'll have to deal with the tongue itself, which the bandits can use as a gigantic weapon.