With this Corrupted Affix active, when you go into a dungeon in Season 4, you'll see occasional Black Empire obelisks dotting the landscape. Interacting with one of these obelisks will pull you into an alternate world, where we see N'zoth's power ascendant and a powerful lieutenant of his stands guard. Defeating that lieutenant will return you to your regular reality, but will do so in whatever location you're currently standing when that miniboss is defeated. This will enable some interesting skips that don't involve Shroud of Concealment or Invisibility. Now of course, if you keep these minions alive and you decide to ignore them entirely, they may come and pay you a visit as you're fighting the final boss of the dungeon, so you'll want to strategize very carefully as you approach dungeons with the Corrupted affix in play during BFA Season 4.