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There are several forms of Pure Flood. A huge beast which resembles a Hunter, a scurrying Flood that moves around quickly, and a "turret" style one which attaches itself to a wall and fires strange projectiles at the Chief. The Pure Flood can change from any of these forms at any time. The scurrying Flood being isn't hostile at most times, but the tank and ranged form always are. Beware of the Tank Form's swipe; it is an instant kill on Legendary mode.