The Bonnacon.

You've heard of the gryphon, the dragon, and the basilisk, but they're nothing compared to the bonnacon:

The bonnacon is a beast with a head like a bull, but with horns that
curl in towards each other. Because these horns are useless for
defense, the bonnacon has another weapon. When pursued, the beast
expels its dung which travels a great distance (as much as two acres),
and burns anything it touches. -- The Medieval Bestiary