Some powers have history. Some powers should not be acquired. Some powers had a plan, should they ever fall. A Worm/Destiny cross that (hopefully) requires zero knowledge of Destiny.
Jamie has survived an entire year and has successfully kept her employment at Hogwarts. Now she has to deal with a family that knows who she is, a government that doesn't want her in the country, and people demanding to know when she'll get married. That, and there's also the pesky after-effects of throwing herself backwards through time.
After Cedric's death, Harry and company summon a demon to kill Lord Voldemort. Except, well, when the hell is summoning a demon ever turn out just the way you planned?
Thestrals can go a lot more places than just wherever you need to go. Unfortunately for Harry Potter, Voldemort is more than aware of this, and doesn't want to deal with Harry Potter anymore.
Harry Potter stepped back in time with enough plans to deal with just about everything fate could throw at him. He forgot one problem: He's fate's chewtoy. Mentions of rape, sex, unholy vengeance, and venomous squirrels. Reposted after takedown!
Instead of Mt. Asama, Sandolphon appears in Mt. Mihara. Can mankind's greatest mistake be defeated by their greatest weapons? Or must it remain, as a reminder of their follies?