14 days after Emergance Day, Marcus is freed from prison and his life sentence for leaving his post during the Battle of Aspho Fields, to join the COG Army once again in humanity's epic fight for survival against the Locust. Together with his best friend Dom and the rest of Delta Squad he is sent on a mission to destroy the Locust Horde.
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ODST's wave-based Firefight mode is Bungie's own spin on the Horde mode Epic had introduced in Gears of War 2 the year before. It went on to become one of ODST's most enduring contributions to the series, sticking around in nearly every mainline Halo game that followed.
