Mechanoid: Watchdrone
Rogue sentry mechanoid.

Indestructible, but irritated by bright light. Target can be herded out of place by exposing it to light. Watchdrones were built by the Luminoth to guard key areas and hinder Ing armies. Most of these units have betrayed their masters, and now serve the Ing. Watchdrones are indestructible and reluctant to move, but can be forced into quitting their posts by exposing them to bright, pure light. Once the light fades, the mechanoid will return to its original resting site.