Dracore, scientific name, is a genus of dinosaur in the family Pachycephalosauridae, which lived in North America during the Cretaceous period. It is a herbivorous dinosaur with small nail horns and lumps covering its skull, and a long mouth and nose. There is a well-developed upper temporal bone hole and a flat skull with thick armor, but it lacks the round arch of the thick headed dinosaur family. In addition, it also has a large amount of intradermal ossification, which is arranged in an irregular form: numerous nodules, small horns, and spikes. Although Dragon King Dragon existed during the Cretaceous period, the latest research suggests that Dragon King Dragon and Styx Dragon are ancestors of the swollen headed dragon, gradually evolving from each other.