My guess is that at the wedding, Ron will die. Or some other Weasley. I don't see Harry using the minions again because he's so traumatized by the realities of war, that only a personal loss would motivate him to seek out Gnarl again, and thereby making Harry more and more corrupted.
Loved Luna calling to her dad that she was on her way to be his mistress. lol.
Author's response
You're on the right path, but not quite there yet. It's still another chapter or two til then, though, as I need to reread the chapters leading up to that. Check out my other works in the meantime and I'll update ASAP.