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'''Halo Devices''' , or '''Halo Artefacts'''{{fn|4}} are [[xenos]] artefacts discovered amidst the ruins of ancient alien worlds in the [[Halo Stars]]. The devices use a process completely beyond the understanding of [[Imperial]] lore to manipulate the body and mind of those they bond with, making their hosts extremely difficult to kill and effectively immortal. However, the price paid is madness, loss of humanity, and strange thirsts and addictions such as the need to consume blood and flesh.{{Fn|1}}