User blog comment:Hyperborean/"The House of Hades" – official expectations blog/@comment-72.95.198.214-20130626142326/@comment-3146930-20130701133953

Oh my gods, the prophecy is about Luke and Percy.
 * A half-blood of the eldest gods
 * A child of the Big Three (it could be argued that this includes Demeter, but lets stick with the Big Three)
 * shall reach sixteen against all odds
 * Will reach 16. In Percy's case, he reached 16 after almost dying a lot.
 * And see the world in endless sleep
 * Percy saw everyone in New York City asleep from Olympus.
 * The hero's soul, cursed blade shall reap
 * This line is talking about how Annabeth's dagger will in some way kill Luke.
 * A single choice shall end his days
 * Percy's choice to give Luke the knife or try and kill Luke himself.
 * Olympus to preserve or raze
 * Percy's choice will result in Olympus being destroyed or saved. If he tried to stab Luke, Kronos would take over and kill everyone, eventually burning up Luke's body. If Percy handed Luke the knife, Luke could kill himself and defeat Kronos.