A Pentaceratops is a ceratopsian dinosaur, a member of the family best known for the triceratops. While the triceratops has three horns, the pentaceratops has a single horn on its nose, two larger horns over the eyes, and a particularly large bony frill with a distinctive U-shaped notch at the top. Like all ceratopsians, the armor class of the pentaceratops depends on whether the attacker is in front of the creature, behind, or beside it.

They are aggressive toward interlopers, attacking anyone who might appear to be a threat. These creatures are about 20 feet long and weigh about 14,000 pounds (7 tons).