DPPF: Destroying the Past to Prevent the Future!

With most everyone they hold dear dead or worse, Harry and the remains of his family and friends make a last ditch effort to escape. When their portal malfunctions and deposits them in the one place they thought they would never see again, new windows and doors of opportunity open to them. Epilogue-ish compliant. Death, lots of death. Torture, lots of that too. Pairings are canon.