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Cain formed an elite squad of demonic killers known as the [[Knights of Hell]]. The Blade is the only thing in existence capable of killing them. After Cain left the Knights for love, they kidnapped the woman -- [[Colette Mullen]]. In retribution Cain killed them all, except [[Abaddon]], who was possessing the body of Colette, and escaped as Cain drove the First Blade into her body. Afterwards Cain made a promise to a dying Colette that he would give up killing, with the First Blade being indestructible, Cain was forced to throw it into the bottom of the deepest ocean to rid himself of it; [https://en.wikipedia.org/wiki/Mariana_Trench The Mariana Trench].

After Abaddon returned and began trying to take over Hell, Dean and the King of Hell, [[Crowley]], began a search for the First Blade. After Cain gave Dean the Mark of Cain, he told them where to lookthat the First Blade was thrown into the bottom of the deepest ocean. Crowley discovered that the blade was recovered by an unmanned submarine long before he reached the bottom of the trench and it has been bouncing around the world ever since. EventuallyAfter it was recovered from the Mariana Trench, they tracked the The First Blade was eventually stolen by a research assistant who participated in its recovery, who reportedly sold it to Portuguese smugglers, who lost it to Moroccan pirates in a poker game, who sold it to the black market antiquities dealer; [[André Develin]], who had sold it to [[Dr. McElroy]] from the National Institute of Antiquities in Kansas City, Missouri, where it was eventually purchased by former [[Men of Letters|Man of Letters]] ; [[Cuthbert Sinclair]] though due to its authentication process being unreliable. After retrieving it after Dean used it to kill Sinclair, Crowley took the First Blade rather than let Dean keep itstating that he will use it only when Abaddon was located. After being captured by Abaddon, Crowley led Dean to the First Blade and Dean managed to kill Abaddon with it. After Dean briefly turned into a demon after being killed by [[Metatron]] while attempting to use the First Blade on him, Crowley took it back in exchange for giving Sam Dean's location and hid it in a crypt in Guam. Crowley retrieved the First Blade after Metatron told the Winchesters that it could be used as part of a cure for the Mark of Cain, but refused to hand it over until they had the rest of the cure. After Cain started murdering again, Crowley lent Dean the First Blade in exchange for it being used to kill Cain. Cain eventually got the First Blade back, but Dean managed to overpower him and kill him in the end. Rather than returning the First Blade to Crowley, Dean gave it to [[Castiel]] who hid it somewhere safe. When the Mark of Cain is removed by Rowena and [[The Darkness]] is released, the First Blade becomes useless.