Verge

Verge was a UNSC colony conquered by the Covenant. The colony had at least one major human settlement, Cuidad de Arias, which was one of the hardest hit when the Covenant attacked the planet. The Covenant would set up a Beacon there to extract Helium-3 from the planet's mantle for conversion into pure energy, which was transmitted to orbiting Covenant satellites and then transmitted wirelessly to ships blockading Tribute in the Epsilon Eridani System. The Beacon was destroyed by Team Black, also accidentally liberating a Yanme'e penal colony in the process.