The Art of Halo Custom Edition

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Oblivion

Author: unknown

Released in September of 2004, this Forerunner base is built in the divide between two mountains. Lofty bases flank a central  facility of unknown purpose. Twisting passageways and tunnels are carved out of the mountain and a single misstep can plunge you into the oblivion of the abyss. 

The guards bases overlook oblivion