Traya. She doesn't need to destroy him to "win". All that she needs to do is incapacitate him or throw him into the depths of Malachor or something like that. Which is easy enough. Simple telekinesis (which he can't possibly counter with her sheer power).
As of 3/14/10, TSL is restored. The Sith Lords Restored Content Modification by Stoney and Zbyl has been finished and can be downloaded here