Next session of Felltower, the plan is to penetrate the so-called "Forest Gate."
Here are all of the known details on the "Forest Gate."
It was discovered in Session 106, Felltower 78. None of the PCs who discovered it are still alive - most died at the eyes of a beholder in Session 112. So all the PCs have to go on is the written record in the summary, basically, as second-hand hearsay.
More details are listed among the "Known Gates."
And that's about it. It's open, it's got vegepygmy and thorn hound tracks around it, it's difficult to access directly. It has not been scryed. It's not clear where it goes or what's beyond it. But it's the destination for next time.