User blog comment:General MGD 109/Who's most powerful?/@comment-3325613-20111204182224

Yeah probably Morgause possessed more of a "brutal" magical force, but Nimueh must have been much older than her (even if she didn't look like it), and had a wider knowledge, experience and power. I think Morgause was a kid compared to Nimueh, she hadn't been an high priestess for long.