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They are a hostile synth encountered in the Institute's reactor room during the quest The Nuclear Option with any faction. Z4K-97B, along with A-2018 and XPN-20A, will serve as the game's final boss during all endings other than the Institute ending.
Interactions with the player characterEdit
|This character is involved in quests.|
- Z4K-97B wears a special variant of the synth armor which is jet black in color and can be shot off by focus fire and explosives, much like power armor.
- Z4K-97B will always spawn as a legendary enemy.
Z4K-97B appears only in Fallout 4.
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