These boulders fall from hanging chasms in Kur and roll over your footing.
They fall at irregular intervals from 2 different spawn points, and roll either left or right every time they hit the ground (randomly chosen). They are only damaged by the Laser Drill, Drone Drill, Red Coat, and Repair Drone's attacks. They explode if they hit a wall.
It is one of the enemies commonly missed when attempting to achieve the Hacker Trophy.
Corrupted Form Edit
When corrupted, the Boulder takes on the characteristics of Bubbles. They float harmlessly upward, and can be killed by a single hit from any weapon.