The Black Tar Rises

This is an adventure for a party of level 4-6 designed to showcase a number of newly created Oozes in the Beyond the Black Pudding compendium. The party is brought in to help figure out what to do about a giant ooze that is threatening to engulf a small town. They discover that it is being called by a magical beacon somewhere nearby, and by following a small ooze they are able to find where the signal is coming from.
It turns out to have been set off by The Visionary, an intelligent Vitreous Humor (a kind of ooze beholder) with dreams of power who discovered it in an ancient temple to Juiblex. Unfortunately, having turned it on, The Visionary had no idea how to turn it off again and is now barricaded in the depths of the temple, assaulted by oozes on all sides.