Hard to tell.
Including Protheans and Forerunners
and Mass Relays and Rings (LOL)
Edit: Precursors too...
Edit 2: ALL OF THE STUFFS IN THE UNIVERSES EVEN TREES
[Edited on 03.25.2012 2:43 PM PDT]
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[quote][b]Posted by:[/b] SilentSnoFall Flood alone would kill everything in ME, also the fact that Halo has super soldiers and ships with slip space and don't require Mass Relays. Just send out battaleon squadrons to simultaneously wipe out the mass relays to limit movement and send in the flood for cleanup. /war[/quote] of course, destroying the mass relays would result in the destruction of most of the ME colonies too so...