History of vital importance to the Protoss, as they believe that great events echo across space-time and serve as lessons for those wise enough to study them. Even during the Aeon of Strife, Protoss scribes recorded the wars and their heroes for future reference. The Observatory is a modern refinement of the ancient scribe library, and it is here that the data gathered by the robot Observers is recorded and catalogued for study by future generations of Protoss.

• Gravitic Booster. By combining anti-gravity theory with current micro-thruster technology, these engines provide increased speed for the Protoss Observer.

• Sensor Array. Observers can be outfitted with enhanced scanners that enable this aerial automaton to better gather battlefield intelligence.