Shit. You think we’d put that in the introduction packets.

[ That’s only half sarcastic. ]

The short summary- there was a world Lachesis, this deity who had the porter made, put imPorts in before. It got destroyed when her sister Atropos came in and destroyed it, and now it seems like Atropos is here. That and Lachesis is apparently weakened, so it’s up to us puny mortals to deal with it.