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Devin does not possess the "Blessing of Atom", therefore making him highly susceptible to Radiation. He is completely absorbed by a religious fast, believing that to be totally faithful to Atom, he must survive solely on radiation. He was an avid user of chems before he joined the children of atom, which might explain his irrational mental state. The Sole Survivor can convince him to stop fasting during the quest The Trial of Brother Devin.
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