The Winter Closet
My players are currently having a lot of fun with a magical closet. This closet is wrapped in chains, and cold air leaks from the doors. Occasionally when people are near, it starts shaking, and growling and clawing on the inside can be heard.
No, this closet does not lead to Narnia. Instead it contains a pocket dimension to a very tiny winter wonderland. A bunch of really angry yeti are locked up inside, and they don't like it one bit. That is what the chains are for, to keep them in.
Well so far they've only opened it once. It took them a while, and they first had countless people look at it, who warned them that they should probably not open it. So open it they did (of course!). Immediately upon taking off the chains, the first two yeti's tried to crawl their way out, clawing at the players that were near. But since the Winter Cabinet was stored in the lower deck of their pirate ship at the time, the ceiling was rather low. So it was rather cramped for the creatures. They were able to drive the creatures back inside and shut the door with a spell or two. So for now the yeti's are locked back inside, but they haven't disposed of it yet.
I suspect the players are planning to secretly use this item on one of the villains at some point. I could tell by their mischievous smiles. I'm curious just how they intend to use it, since the yeti's will pretty much just attack anything in sight.
Charming them could definitely be an option, since yeti's are humanoid creatures. But my players rarely use charm spells. The yeti's are also rather angry (who wouldn't be, after being locked up in a closet for so long?), and unpredictable. So it may be easier to just open the closet in front of some bad guys, and make a run for it. Then again, it is a rather large and heavy closet. Its not like you can just carry it around. You need a crane to lift it at least. But maybe they could use it to set some sort of trap.
My players did attempt to create an army of Chuul (giant evil lobster monsters) earlier, by stealing a bunch of Chuul eggs from one of their nests. But then one of the eggs hatched prematurely on board their ship, and that one Chuul escaped. They have no idea where it went. This got them nervous enough to want to quickly sell the other damn eggs.