Gravity globe

A gravity globe, or grav globe, was a human device to provide massive illumination. It could be sent aloft under its own power such that it would "hang" at a certain height and provide downlight over a large area. Grav globes were particularly useful in large caves.

A gravity globe used in the core of Krop Tor. (DW: The Impossible Planet)

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A gravity globe used in a Maze of the Dead on Alfava Metraxis. (DW: The Time of Angels)

Ida Scott used a globe to light up Krop Tor's core. (DW: The Impossible Planet, The Satan Pit)

The Clerics used a globe to light up the Maze of the Dead. (DW: The Time of Angels, Flesh and Stone)