Spectre's Judgement (Death's Vengeance)

Harry sacrifices himself to save his friends from Fiendfyre in the DoM. He dies and ends up in a strange limbo where he is greeted by Salazar Slytherin. He finds out a few things, and trains for years inside this strange place. A year passes outside and the war against Voldemort is going badly. Then Ginny Weasley sees heavenly light in the sky. H/G, AU after OotP