Sentry Bot is a robot protecting Big Town alongside Protection this is the first Sentry Bot seen by Cywren and Vent.

It is unknown how it was damaged in the first place although it is thought it was damaged in the first Super Mutant raid.

It was rebuilt to battle the Super Mutants attacking Big Town, in the middle of the battle it stepped on a land mine so attacked and killed Cywren resulting in her first death, after respawning they won the battle and saved Big Town from the Super Mutants.

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