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"The lesson will be taught in due time, Aloy. Until then, we wait." This article contains heavy spoilers. Read ahead with caution.
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The Master Override is a unique quest item in Horizon Zero Dawn and Horizon Forbidden West. It is an extraordinary overriding device used by Aloy in the final main quest to purge HADES and is used throughout Horizon Forbidden West to reset GAIA's subordinate functions to their original non-sentient state prior to Nemesis' Extinction Signal.
History[]
The Master Override was originally created as a means to purge GAIA and her subordinate functions, if necessary. Although Elisabet Sobeck initially resisted Ted Faro's push to install a "kill switch" in GAIA, she eventually relented and installed the master override after GAIA herself agreed.[1] [2]
Associated quests[]
The Mountain that Fell[]
The override was mentioned by Sylens when he met with Aloy in the GAIA Prime facility. He instructed her to purge HADES using the Master Override. Since Aloy was genetically identical to Elisabet Sobeck, she was the only one able to enter the room to claim it. Afterwards, Aloy installed the Master Override inside Sylens' Lance, carrying it with her from then on. Aloy eventually used the override to purge HADES and the extinction protocol, thus averting disaster, unaware that Sylens' Lance had in fact transmitted its intelligence to him for interrogation.
Death's Door[]
Aloy used the override for real on HADES upon finding its current processing orb at LATOPOLIS. Even as HADES mocked her efforts to rebuild GAIA and restore the biosphere, Aloy ignored it as she used the override.