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That is unknown as of yet! Merlin is able to command the dragon, but its loyalties lie with Morgana. She was reluctant to obey Merlin, so I believe that her being tortured made her unable to communicate with Dragonlords, so this way Morgana has more powers over her. It's just an assumption though. Morgana640px-Morgana PendragonForever12:14,10/14/2012