The X-111 compound was created by Scribe Neriah of the Brotherhood of Steel by analyzing the blood chemistry of mutated creatures to better understand how their bodies handle excess radiation. Named after the Vault from which the Sole Survivor hails, the compound allows for a human to purge their body of radiation much more effectively than RadAway by mimicking the cleansing processes that occur naturally in the bodies of mutated creatures.
- Scribe Neriah on the Prydwen will manufacture one after bringing her 20 viable blood samples with the quest Blood Bank. Afterward, they can be obtained from Neriah every couple of days.
- On Survival difficulty, the X-111 compound only removes 60 rads, yet removes rads instantly while RadAway removes them over time.