This time I bring you a secret boss fight. Like Muffet and Glyde, this monster design and its fight made it into the game thanks to one of the kickstarter goals of including your own monster in the game. This tier was that of "make your fantroll canon" and it was awarded to the first person that donated $1000 to the game's kickstarter.
You can get this event at any time after you reach the MTT Resort and only if your PC's date is set to October 10th, at 8 pm.
Killing this monster does count towards your kills during the game, so don't kill him if you're doing a pacifist playthrough.