Flood pure form

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, Ranged, and Tank form.

Pure Form Stalker-The Pure Form is built within a framework of recast bone.20

Pure Form Ranged-The Pure Form creates its missiles from battlefield detritus.30

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