You are in the woodlands of North America, 34 million years ago.

The air was thick, humid, and smelled of lush, subtropical greenery. Walking along a stream, you heard it—a deep, low vibration that seemed to shake the ground beneath your feet. You froze behind a thick fern bush.

Emerging from the mist was a behemoth. It looked like a rhinoceros, but its head was impossibly large—a "mega head"—and instead of a keratin horn, its nose was adorned with a massive, Y-shaped bone structure covered in dark skin. It was easily the size of an African elephant, moving with slow, deliberate power.

As it approached the riverbank, it began browsing on water bushes, its large, blunt teeth stripping the foliage. Its eyes were small and set far back, seeming more focused on feeding than on you. You remained silent, watching the "thunder beast" graze in its Eocene paradise, knowing it was the undisputed master of this landscape…