It appears to be some sort of inhaler, and boosts all SPECIAL attributes by two points for two minutes, but is highly addictive.
- Kanawha Nuka-Cola plant, an X-cell can be found in the medical room upstairs to the left.
- Horizon's Rest, a single X-cell can be found in a chem box underneath one on the airplane seats.
- A single X-cell can be found on a shelf halfway up a windmill just northwest of Top of the World.
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