Edit 31/12/2017: Whoops! Forgot the PDF, my bad. It's attached now.
I don't know about you guys, but my GMing folder is full of potential monsters that haven't gotten used. The Bellicorn - as in, bellicose (meaning 'warlike') and unicorn - is one I re-found recently, and thought was interesting enough to write up as the star in an adventure in it's own right.
There's a few others I intend to come back to in the coming months, like the Idiot Pilgrims and the Pine Agaric (watch this space). But for now, I hope you enjoy this adventure!