That's what Spartan Assault was. Not Halo 3 on Steam. Not H2Anniversary.
Lady Egghead repelling a post-original trilogy Covenant assault on a UNSC world before discovering a Forerunner Death Star tucked away in its moon and blowing it to shit.
Goddamnit, 343.
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Except it's not a Death Star because it can build planets.
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Rats Htaed.
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Nope. It's a Forerunner Mining Vessel used to mine and recompile planets.