Background

During the second book of Way Of the Wicked, the Players spend 222 days in THE HORN OF ABADDON! Performing an evil ritual to 'Call forth Darkness', that is to summon a Daemon Prince. That's a long time in one place, so in order to perform this vile ritual they will need to ensure they are well protected against the forces of good that seek to stop them as well as troublesome adventurers!

The Design Need:
Yes, the players get their very own evil dungeon, a lair that they need to defend! The dungeon you get in the book is very big, and quite flavourful but there's a way too many empty rooms that don't really have a purpose. There's also not really any rules to customise or run you're dungeon in any effective manner. After all Pathfinder is an TTRPG adventuring system and doesn't have too much support for 'spend almost a full year in the same location DEFNEDING against an adventurers.' So running it with some very experienced players we ended up having to house rule quite a bit.

There are some interesting rules for running an organisation, but the book goes for; moustache twirling, comedic villainy rather than serious dark lords! Because of this, a lot of result of you're rolls is utter failure. On a good day, you're minions might manage to capture a single CR 3 creature. Of which you would need atleast 3 of in order to be a easy encounter for the lowest level party of 4 adventures that the book sends at the players. At my table, it would be the sort of encounter I would not bother to run for my players.

My players quickly got fed up of this system, so we ended up making a lot of changes. And now that I am running the book for a second group of players I went back and not only completely redesigned the dungeon to remove a lot of the empty space and create more interesting areas for encounters that could be changed and modified as the players wanted. But, created a suite of rules for how they can modify and improve their dungeon by adding 'rooms' and 'shrines' that provided functionality to it. To support the fantasy of running an Dungeon, being the dark lord at the ahead of a competent evil organisation. And being the final boss, that those who are lucky and powerful enough to get to the inner sanctum will face.