672. In the conclusion to the fourth story arc, Blackwing, Vaarsuvius' familiar reveals what he saw within the rift: a planet. Not the Snarl, which is supposed to be the overarching manifestation of chaos doomed to unmake the world (although it's not incredible to discount it still being omnipresent in a way we've yet to understand), but a lone planet.
759. Knocking off Elan's rose tinted glasses takes a big punch, but his dad delivers.
830. Redcloak reveals his plan, is elevated to new levels of awesome... and offs a recurring villain in the comic.
842. Familicide is revealed to have a direct and devastating effect on the plot, and on V's character arc.