6dc5455c____The_Coppermind___17th_Shard__Entry
[Chapter] 23 [Entry] 
During the early days of Kelsier's original plan, I remember how much he confused us all with his mysterious "Eleventh Metal." He claimed that there were legends of a mystical metal that would let one slay the Lord Ruler—and that Kelsier himself had located that metal through intense research. Nobody really knew what Kelsier did in the years between his escape from the Pits of Hathsin and his return to Luthadel. When pressed, he simply said that he had been in "the West." Somehow in his wanderings he discovered stories that no Keeper had ever heard. Most of the crew didn't know what to make of the legends he spoke of. This might have been the first seed that made even his oldest friends begin to question his leadership.
The Hero of Ages/Epigraphs - The Coppermind - 17th Shard
Entry