Any chance of getting the Aurors down to Antarctica for healing, fire spells, and general magical bullshit?
Also, if we're going to be dealing with Antarctica, we might as well have "Shoggoth Battle Plan B", AKA Destroids, ready to enact deadly death of killing on any large amount of enemy forces that slither out of the city.
While we're doing this, Egon and Data should learn all the Ravenloft, in an attempt to figure out exactly how you're meant to stop a Dark Power.
The Farseers should try to work out what Cheryl's role in this is, and also if we're still on a 1-week deadline. If she's the key to the entire world, then her role isn't done after Silent Hill, but I can't think of what she does next.
Science team is currently working on the Aglaphotis? Switch to Offensive Reality Emitters, in case a Reality Emitter is capable of hurting the Ebon Night.
Ravenloft likes to keep its darklords in place by playing on their obsessions. It may well be trying to stick us in this world owing to our obsessions for fixing reality and/or acquiring loot. I wouldn't put it past the Ebon Night dragging more canons into the area, to watch in amusement as we continually struggle.
Heck, the Ebon Night may well be using us as an interdimensional assassination and garbage disposal tool. It sends us stuff, we kill boss monsters, it kicks us out before we can loot absolutely everything, and it sends back the boss-free rubble with half the loot intact - after having done only a fraction of the work itself.