The Flood Nest' is a Flood Building in the strategic game Halo Wars. It can create Infection Forms and Carrier Forms. The Nest has a number of tentacles surrounding an opening which resembles a set of lips, which spits out swarms of different Flood forms. If you let some infection forms kill and take over your marines or flamethrowers in Mission 8 Anders' Signal, they will begin to spawn from the Flood Nest. It will also carry on to Mission 9 the Flood, and possibly Mission 10 Shield World .
This will also work in skirmish with Jackals, Brutes, Elites, and the Brute Chieftain.
NOTE: There are no Flood Nests in skirmish, just Flood Colonies, Infection forms, and Infected Marines. It will most likely only work in a standard match in the map Crevice.