Bellerophon's Last Ride by devilry
This is based on the Greek myth of Bellerophon and his attempt to reach Mount Olympus on his winged steed Pegasus. The gods didn't like his arrogance, and so they sent a gadfly to bite Pegasus. The horse reared at the pain, and Bellerophon fell off and plunged to earth. Here I have replaced the gadfly with something bigger.