We’ve discovered that you can get in the MK realm through a regular haunted door. It seems they have a 1 in 10 chance of spawning the portal.
Go up to a regular door, hit the “Trick or Treat” key, if it offers a portal an “Enter” key will immediately pop up.
There’s a place on our server in Gendarren Fields where 3 doors spawn very close to each other, just north of the Brigatine Waypoint, two on the beach and one on the hill. Get in pretty quickly now, give it a shot! 