Sentinels

The Sentinels are autonomous drones that were built by the Architects to watch over Spectra and protect its inhabitants in their absence.

Appearance
The Sentinels are described as a half-meter wide sphere with three curved fins attached to it on the top and each side in a triangular arrangement. On the front of the sphere is a glowing blue triangle that acts as its 'eye', and the Sentinels' design is described as appearing somewhat biological in its anatomy despite being made entirely of metal.

Behavior
While not inherently aggressive, the Sentinels are programmed to follow four galactic rules known as the Tenets: a Sentinel's judgement is absolute, all are equal in Spectra, don't visit another race's Plane without invitation, and never attempt to enter Eden. If anyone is to break these rules, the Sentinels will immediately turn hostile towards the offender and will generally terminate them.