Reckoning

The Reckoning is when the Black King uses the White King's staff to start the showering of Meteors on Skaia. Skaian defense portals divert the smaller meteors back in time, according to the Trolls. In the Homestuck Kids' Sburb session, the Reckoning happens early. This is because of Jack Noir, who was previously in charge of paperwork in Derse, but then through Weird Time Shit got one of the strongest weapons in the game all thanks to Jade and went on a rampage killing the Black Queen, Black King, White King, and will eventually kill the White Queen as well.

The Reckoning is also, in any Sburb session, the way that the Paradox Clones go back in time to re-create themselves. CarcinoGeneticist mentioned that this was one of the many points and riddles of the game in one of his conversations.