You are the new owner of Dredgen Yor's original Thorn. Merely holding the gun makes you nauseous—not out of moral principles, necessarily, but instead a very physical effect which reminds you of losing your Light during the Red War. You don't know what to do with this… thing. You have no intention of firing it. If nothing else, you believe you need to neutralize it. Neutralize the Thorn's intrinsic Darkness with the strength of your Light.