From June to July 2012 the talented Heather Sinclair produced a wonderful story 'Death's Knight' a crossover of Harry Potter and the New 52 Heroes. Available here: /s/8187641/1/Death-s-Knight. Heather's story ran out of steam, but she gave me permission to adopt it. Where her's started 5 years after the end of the world, mine starts about 20 minutes before.