Harry finds a spell in a book (at Grimmauld Place) that supposedly revives the dead. The incantation is really simple, one word, something like "rev---." He tries it on a grave way in an underground cavern or something under Grimmauld first, sometime in the summer, and realizes it doesn't truly bring back the dead but revives them for a short period (a few minutes).

He doesn't use it again until the very end, when Voldemort attacks Hogwarts, unleashing a huge fire and sealing the school shut.. most people get out but Harry, Dumbledore and Voldemort continue fighting, and Dumbledore is killed. Harry uses the spell to revive Dumbledore, who is shocked that he's not dead and disappointed he hasn't passed on yet, but gives Harry a distraction so that he can beat Voldemort.

Anyone have any ideas? This is an old story.

 

Why would you search for such an idiotic story?

 

That's such a really bad spell. Whoever wrote that story isn't a good spell-creator. Just hearing about that makes it sound lame. Why would you be interested in this story? Is it because you're bored?