The arid, rocky basin of North America was once a lush and vibrant ecosystem, teeming with life. But now, 66 million years later, it was a desolate and unforgiving landscape. A decade of severe drought had transformed the once-waterlogged region into a dry and dusty wasteland. The wind howled through the empty canyons, carrying the dust of long-desiccated bones of creatures that once thrived in the area. Now, only beetles and plant life suited to the harsh climate remained. But even in the face of such adversity, some creatures refused to give up. Among them were A Herd of pachycephalosaurus's - a herd of ten resilient dinosaurs, determined to survive in this harsh environment. Known from their thick, dome-shaped skulls, which they used not only for Dominance and display, but also defense, they are the third survivors of the north American dinosaurs before the KPG Extinction Event happened later.

The leader of the herd was a large old male, with a massive, vibrantly-colored dome that bore scars and horns from countless battles. He was a fierce and respected leader, and the rest of the herd looked up to him for guidance. As the herd moved through the parched lands, the leader was constantly on the lookout for food and water, as well as potential threats. One day, as the herd gathered around a dead tree, the leader used his powerful head to knock it to the ground, revealing a swarm of insects within. The other members of the herd eagerly rushed forward to feed, but the leader remained on high alert. He climbed up on a nearby rock, with most of the other members assembling around him, as he surveyed their surroundings. One wrong move from A potential predator and its headbutting Will be fatal.