Doesn't matter. V is fighting a DM screws you for killing what ought to be just another monster dragon parent. Now like many other characters, she is doomed because she had part in slaying what too many DMs and Game Designers think are wonderful and majestic creatures.Hmm... that anti-magic shell doesn't extend as far as the dragon' feet, does it? I wonder if the dragon will get overconfident?
What exactly do we expect Qarr to do, assuming V accepts his offer?
What makes anyone believe that Qarr could save V or defeat the dragon?