Dark Lands is a dark magical prison/labrynth created by a long dead Dark Mage. His secrets were kept alive by his followers and they sold enchanted artifacts to those with enough riches to purchase them. These artifacts contain the power to spellcast the target into the deadly prison where it’s victims worst nightmares are manifested into reality. Read more in the full version!
In the middle of an unimportant combat with some bandits a burst of wild magic transforms all of the PCs and their opponents in to random animals and monsters. They retain their intelligence (though not, of course, the ability of speech). They can either carry on the combat in their new forms, panic, or otherwise react how they see best. After about an hour, they return, unharmed, to their normal form.