Talk:Celestia/@comment-4899875-20120706032551/@comment-4520079-20120710193726

Here's a DA comment where Lauren Faust explains Luna's banishment: http://comments.deviantart.com/4/1603670/2282753953

The only time ever mentioned so far that Celestia used the E.O.H. before Luna's banishment was in "Return of Harmony" where it's told that she used the E.O.H to turn Discord into stone with Luna's help. So she probably can't do much if she welds all the Elements on her own.