Since then, I’ve been brewing on the idea some more, and finally came up with a 5th edition creature responsible for the mushrooms. The creature is called the Drydak, and you can download the PDF for the Drydak here. I modified some of the information from the original Drydak Mushrooms post. This will be the 1.0 version of Drydaks. I plan to incorporate them more often into my games.
If you use them, please tell me about the cool adventures you come up with.
This is released under the Open Game License which is included in the PDF.