“Yes!”  Celestia’s eager response didn’t go unnoticed by Twilight.  “King Sombra…Luna is, well, rather good at understanding the magical theories behind his powers.  I must confess, I had broached the subject with her quite some time ago, shortly after we suspected that the Crystal Empire was about to reappear, but she was concerned that some of its corrupting nature might cause you problems.  Of course, I do not mean to offend you by saying this, I am just stating what her concerns were.”