Active Camouflage Combat Form

An Active Camouflage Combat Form, is a variant of an Elite Combat Form. They appear in Halo: Combat Evolved, and in Halo: Combat Evolved Anniversary. They were originally Stealth Sangheili, who were infected by the Flood.

Description
This variant of Flood has the same amount of health, as a normal Elite Combat Form. However, Active Camo Combat Forms, possess different qualities. Since their host's Active Camo armor is still functional, it allows these flood to turn invisible, making them deadly foes. Also, these Flood don't carry weapons, unlike their other kin.

Due to the new graphics in Halo: Anniversary, these enemies are significantly more of a threat, than they were in Halo: Combat Evolved. The Active Camo of the Combat Forms, in the first game, was extremely clunky. The "invisible" effect made them look gray, and didn't blend the Flood into their environment. In the new graphics, however, it is impossible to see those types of Combat Forms. They are difficult to deduce from their surroundings, and will take advantage of your confusion, and maul you with deadly effect.

How to Encounter These Enemies
This variant of Flood only appears in one level: The Maw. Close to the end of the level, when you are going to the Engineering room, travel into that room. Instead, take the opposite hallway. There is a door, and an arrow, on the floor, says "Armory." (Please note, that if you don't go into the armory, it's okay. Cortana will inform you of it, when you destroy the core.) When you enter the Armory, red dots that symbolize enemies, will start to appear. The first enemies you will encounter in the Armory, will be the Active Camo Flood forms. It is tough to kill these enemies, because they are invisible, and it you don't spot the "air auras" around them, they will kill you within seconds.