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The Hidden Flood Combat Forms are Easter Eggs in Halo: Combat Evolved and Halo: Combat Evolved Anniversary. These Combat Forms can be found in the level 343 Guilty Spark running then randomly stopping on top of the wall around the level. They do not take any harmful action towards the player.
Hidden Flood Sangheili Combat Form #1
Hidden Flood Sangheili Combat Form #2
Hidden Flood Sangheili Combat Forms #2, #3 and #4