Harry Potter and the Immortal of Azkaban (смешанная)

When all the death eaters broke out of Azkaban, they woke a certain prisoner who has been in there for a very long time. Practically as long as the prison has been built, maybe even longer. Was he put there because he committed some atrocious crime? No, nothing so dark and dreary.
Immortality to some seems like a blessing; some people strive for it, kill for it even. But some see it as a curse of an endless life. Some people wish they were just normal human beings. Living a 100-year lifespan. Maybe even the wizarding 200-year lifespan but no more. One man wishes for death. But could never grasp it. Until he meets the master of it. Or at least the soon to be master.
Coming into a new world with Dark Lords and young children fighting in a war, they need not fight. An old sorcerer joins the battle.
(Currently editing)