Forerunners are the new antagonist. The planet Master Chief and Cortana drifted to is a Shield World ... a Dyson sphere: a hollow planet rotating around the star (white dwarf, Earth-sized) inside of it. This is a surviving colony of Forerunners that are perhaps living peacefully (until now) since the previous Halo Array activation.
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Forerunners are the new antagonist. The planet Master Chief and Cortana drifted to is a Shield World ... a Dyson sphere: a hollow planet rotating around the star (white dwarf, Earth-sized) inside of it. This is a surviving colony of Forerunners that are perhaps living peacefully (until now) since the previous Halo Array activation.
http://steamcommunity.com/id/Cloudsol/