Good start. Question to a response...no wood weakness? Are you using Alan Scott's version of the GL power then, or Kyle's (which had no weaknesses, the yellow weakness was removed)? Of course they've restated how the yellow weakness works so much it's crazy, so who can tell? Looking forward to more of all your stories.
Author's response
-Kyle's as introduced. When I noticed that Kyle got the ring in April of Harry's third year, I fiddled with the vagarities of time space to have Ganthet arrive on Earth in July, and make a slightly different decision...
- I'm using the powerset of Kyle's ring at the begining...