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Although what you pointed out specifically seems more like a contrived reason (not to mention that the guys in the vault are arguably darker than any DRK anyway), it's pointed out over the course of the DRK questline itself that their powers probably just run on Strong Emotions anyway, regardless of what they are; just as you have DRKs that run on pain or anger or whatever, it's also possible to have DRKs that run on unbreakable love or uncontrollable happiness.
Something to think about.
Although what you pointed out specifically seems more like a contrived reason (not to mention that the guys in the vault are arguably darker than any DRK anyway), it's pointed out over the course of the DRK questline itself that their powers probably just run on Strong Emotions anyway, regardless of what they are; just as you have DRKs that run on pain or anger or whatever, it's also possible to have DRKs that run on unbreakable love or uncontrollable happiness.
Something to think about.
