Bruisers

Pachycephalosaurus has the Bruiser trait

Bruisers are creatures who specialize in the infliction of injury damage. Bruisers are capable of dealing significantly more injury damage than their damage would otherwise allow. Bruisers are also capable of inflicting injury damage while mostly ignoring locational constraints that often necessitate hitting a creature's legs to inflict injury. A bruiser will not inflict injury if it hits a larger creature in the tail. Currently, the only creature with the Bruiser trait is the Pachycephalosaurus.