Flood pure form
From Halopedia, the Halo wiki
This is a new form of the flood that is yet to be released and confirmed. There are three unconfirmed sub form such as Stalker Form, Ranged Form, and Tank Form. Each Pure Form can mutate into another.
Pure Form Stalker-The Pure Form is built within a framework of recast bone.
Pure Form Ranged-The Pure Form creates its missiles from battlefield detritus.
Pure Form Tank-The Pure Form is an engine of war crafted from living flesh.
Heres a link http://www.bungie.net/Stats/GameStatsCampaignHalo3.aspx?gameid=22671
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