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The Gellar field was invented along with the [[warp drive]], allowing [[warp]]-capable ships and their occupants to actually survive the hostile environment of the warp. It protects the ship and its occupants from the hostility of the warp itself as well as from the predations of warp entities such as [[Daemon]]s.{{Fn|1}}  Many classes and variants of Gellar Fields are generated via fields exist {{Fn|3}}, and forge worlds specialising in field technology such as [[Belecane]] fabricate warp drives alongside [[stasis]] fields, [[Void shields]], and other protective barriers. Some Gellar field generators used during the [[Great Crusade]] use a comatose [[Psyker]] slaved into the bowels of Imperial vesselsto generate a Gellar field.{{Fn|2}}