LP 656-38 e
From Halopedia, the Halo wiki
LP 656-38 e[1] was a planet in the LP 656-38 System.
It was a Forerunner world before the Flood invaded with over 1.5 billion beings, scattering the Forerunner population into hundreds of smaller groups hiding in small ground structures across the planet while a main contingent of 9 thousand survivors barricaded themselves within the central government building while the Flood ran rampant across the world. All Forerunner survivors on the planet fell to the Flood in just over a week. After this the flood army was bombarded by the forunner fleet.
