You are in the scrublands of South America, 15,000 years ago.

The sun was barely breaking over the damp, marshy plains. You were trekking along the riverbank, the thick mud sucking at your feet, when a low, tectonic rumbling stopped you mid-stride.

Slowly, you turned. Emerging from the tall reeds, moving with a ponderous, rhythmic gait, was a Panochthus.

You froze. It was easily the size of a small hut, its dome-shaped carapace covered in a mosaic of rough, dark bony plates that seemed to absorb the light. It wasn't moving fast—nothing that big needs to—but it commanded the entire landscape. Its tail, a massive club of armored rings, dragged slightly, leaving a wide trough in the mud.

As it fed on a patch of low shrubs, you heard the crunch of vegetation, sounding like snapped timber. It raised its head, the blunt, armored snout covered in muck, and stared directly at you with small, dark eyes. There was no aggression, only a deep, ancient indifference. You are a flea compared to this armored titan.