Troisi (Earth-5875)

Troisi, also known as CE-2-1239 to the forerunners, is a planetary system located 42 light-years away from the Sol system. It has five planets, including the human Outer colony Coral.

History
The planets in the system were once in the control of the forerunner Ecumene. Eventually, the system was colonized by humanity in 2276, with its fifth planet being named Coral, while a space station was built around it three years later. In 2552, Coral was invaded and attacked by the Covenant, which glassed its population, killing most of it.