It is hardened against EMP and radiation, and has filters that are completely effective at removing toxins and bacteria from local atmosphere. The battlesuit is a sealed system, capable of extra-vehicular activity for a limited amount of time or operations in toxic atmosphere. The inner skinsuit is made of a moisture-absorbing synthetic material linked to an environment control computer and the occupant's UNSC-issue neural interface. The gel layer regulates temperature and can reactively change its density. The suit contains a gel-filled layer underneath a thick black armored bodysuit. The armor's shell is composed of a multilayer alloy of remarkable strength and has been augmented with a refractive coating capable of dispersing a limited amount of Covenant energy weapon strikes. Each generation of the Mjolnir battlesuit is composed of major fundamental components construction of the suit is done in overlapping layers and has been remarked of it being akin to a giant three-dimensional puzzle. Unlike the powered exoskeletons that preceded it, the Mjolnir battlesuit was designed from the ground up as a suit of armor its design philosophy would serve as a basis for all future powered and semi-powered armor system designs. In its final iteration, Mjolnir is a highly advanced suit capable of further enhancing the Spartans' physical performance while also doubling as a platform capable of handling an artificial intelligence network. Spanning over three decades of development, Project MJOLNIR encompassed more than just a suit of armor, but as a pioneering effort intended to shatter current technological barriers. MJOLNIR is considered by the Librarian to be the fulfillment of a millennia-old geas she had implanted in humanity a hundred millenia earlier, intended to help them reclaim the Mantle. Catherine Halsey, MJOLNIR is an attempt to create a powered exoskeleton capable of taking full advantage of the physical capabilities of a Spartan. Each suit alone costs as much as a small starship. Created parallel to the SPARTAN-II program by the Office of Naval Intelligence's Materials Group, the Mjolnir armor is the most advanced piece of tactical military hardware in human hands.

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