I nav-meshed the catacombs, and wired up the lock puzzles. That was the easy part, and when nav-mesh is easy ...
A lot of time was spent figuring out how to capture the death of a leveled character, as the mini-bosses control the book doors to access the Succubus factory. I had to make them aliases of a hidden quest to do that, and even then it wasn't obvious how.
And I made a start on the documentation. The quest that drives it all is only half-formed, so its page is vestigial. Since I put the Monastery at the edge of the map, it probably needs a start for the quest in one of the main cities, or you might never find it. Once you get there, you have to find a key, unlock the crypt, go follow the path down to the Abyss (which may go through multiple levels eventually) and then that level is a maze of corridors, with rotating doors that send you all over the place.
And of course, boobies everywhere. They start in the Monastery, and continue up to the final boss. Azura and Nocturnal come to assist, and let's say they've got into the swing of things, too.
The documentation reflects that, so follow the link only if you're not offended. Expect broken links, as it's under construction still.