Hold the Line
A fort in the wilderness is surrounded by enemies on all sides. The players will need to marshal their allies and defend the fort from invasion.
A resourceful and courageous goblin “inventor” named Grobnaz has obtained a large number of alchemy ingredients (via perfectly legal channels, of course) and is mixing them more or less at random, then trying to sell them to passing adventurers. You never know what you’re going to get.