Z-4190 bubble shield (Earth-5875)

The Z-4190 Temporal Protective Enfolder/Stationary Shield, better known as the bubble shield is a personal defense system originally developed by the forerunners and later reverse-engineered by the Covenant.

History
The bubble shield was originally developed by the forerunner Builders, who issued them to the Warrior-Servants during the Forerunner-Xenomorph War, based on the hexagonal forces used by the Sentinels. This technology was later discovered by the Covenant in the twentieth-first century, being reverse engineered to be used by sangheili warriors of the Covenant Armada. Through their war against humanity, the Covenant used bubble shields in multiple stances, such as against SPARTAN-II Blue Team during Operation WARM BLANKET in 2544, as well as the Fall of Reach, the Battles of Installation 04 and 05, and the Battle of Earth, all in 2552.