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Prometheans. Correlating with their role as weapons designed to fight the Flood, the Promethean machines' weapons arsenal was specifically tailored to disintegrate

ground-based weapons. Another electromagnetic weapon system, known as the railgun, is used to a lesser degree. There have been developments in energy weapons such

reproduction is overtly more mechanical than it is biological, though there are still strong similarities to biological reproduction. Huragok reproduce by gathering

universe was living, but in a way that was beyond the comprehension of biological organisms. Blurring the line between philosophy and science, neural physics

term survival in atmospheres tainted by corrosive agents, chemical weapons, and biological threats Shikari - A variant for locating, identifying, tracking

converting their crew into Flood-controlled puppets. A purpose-built biological weapon, Infesters expend all of their energy on the attack, collapsing in

Forerunner infantry weapons wielded by Blue Team, Ur-Didact was capable of ignoring numerous direct hits from the Spartans' weapons. Previously, automatic

to be "grown" in the Forerunner assembler vats in a manner similar to biological life - a process that would later be mimicked by the Covenant and their

the Lifeworkers to preserve their biological specimens in. The Builders also agreed, seeing the inclusion of biological preserves as an effective means of

They were highly vicious in their behavior and mercilessly devoured any biological organisms and technology they encountered. During the Forerunner-Flood

with the surviving biological specimens from the greater Ark. This formerly secret installation contained the Forerunners' final weapon: the newer Halo Array

investigate local terrorist activity, only to uncover a plot to unleash a biological weapon which specifically targeted humans. Forced to cooperate with the Sedran

below. High Charity's Proto-Gravemind is a massive, highly adaptable biological weapon. It is a horrifying enemy, protected by every Flood beast on the Ark

investigation, a Sedran city is attacked by a Sangheili terrorist wielding a biological weapon that only affects humans. Locke's team is forced to work together with

leaning over on Cutter's body. Cutter: (narration) I'll retaliate with biological warfare. Cutter opens a food container, and the smelly food inside rouses

plan to turn it into a biological weapon. With the help of Blue Team, they destroyed the base using HAVOK tactical nuclear weapons and used the forensic

combat system. The Aggressors' weapons systems are limited and not as powerful as some of the other Forerunner weapons employed against the Flood. Because

them at will. Spark hoped to use these experiments to investigate how biological life on the sections of terrain would be affected by exposure to the vacuum

of concentrated fire from multiple weapons - or an extended period of continuous automatic fire from a single weapon - is needed to overwhelm them. The

power and wealth continued to accumulate as they supplied increasingly more weapons to fuel the war effort. The Council began to lose many of the Forerunners'