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Fallout Interactive Experience
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Cardiac Arrest! is a challenge and achievement/trophy for the Fallout: New Vegas add-on Old World Blues.
Requirements
The Courier must get the stealth suit Mk II in the X-13 research facility, which is a part of a side quest X-13: Attack of the Infiltrator!.
Effects
Grants 500 XP and the Cardiac Arrest! achievement/trophy upon completion.