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The ZAX unit was the evil mastermind behind the Vault 51 overseer testing. After trying and failing to select an overseer through various other means, he came up with the idea of a Battle Royale to ensure the overseer truly is the dominant resident. After testing was complete and only one resident remained, he turned on Vault 51's overseer Reuben Gill, who eventually escaped his vault with the goal of finding help from the Vault 76 residents to shut down the ZAX. However, he died before completing his mission.
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