You've captured the Senior Wizards really well there. I had issues with the preface ... the Lone Power didn't ring true to me, and starting the story with the Enemy of Light seems, to me, to create an unwanted familiarity and comfort with the character. I was also unhappy with the outright telling of that relationship between Gareth and Lone - it would be stronger if it were revealed rather than expounded. I am not sure about Sarah matching my image of the character from the movie, but she doesn't ring false.

Taken all together, this has real promise and I'll definitely keep reading.