User blog comment:Greenberet69/Elrond vs Duncan/@comment-2006360-20120403171918

Elrond did not leave the Elves at the Last Alliance. Gil-galad did, the first bearer of one of the Three Rings. Elrond was his second-in-command, and when Gil-galad was killed by Sauron, the Ring went to Elrond and he still has it. He apparently can use telepathy with other bearers of the 20 Rings of Power, including the other two who bear the Three Great Rings that were given to Elves (Galadriel and one other who surrendered his Ring to Gandalf).