EDIT: Winner winner free fake internet points to:
Thanks for playing frogs!
(Answers in the stickied comment)
If you have seen me post about this drop before, please be cool and lurk only. 🐸
NO MODS can guess!! (because they KNOW)
I'll provide the answer at the end of the day. Depending on how it goes, I'll drop a few hints along the way.
Voldemort is first met in chapter 17 of the first Harry Potter book. Over the next 7 years, Harry is saved by Hermione 17 times. 17 years pass between Voldemort's first attempt on Harry's life and the one that was (temporarily) successful. There are 12 uses for dragon's blood (as discovered by Dumbledore), and 5 adult dragons that factor into the plot.