Kind of to the original Post. Kind of to the expanded Post.
All these are just ideas I am getting from the post, and hope that it might trigger a train of thought in you to make it to the next hump.
Have a concept of the True Nature of the Tower.
It is a Well of underworld power the original designer made to pull power from the land of the Dead.
It is a shell to contain a piece of the Demon Realm on this prime material realm.
It is a Magic conduit designed to accumulate all magic in the world…originally there were supposed to be at least 12 others, but Azkol could not contain his desire for Power enough to complete the others.
You can have all 3 of these as truths, and it will only affect theme and design, to keep it fitting all 3, or you can focus on one of them.
Who where the powers?, what happened to them?
When the new Landlords came in, the subjugated or chased off their competition. what are those who escaped doing?
What is the nature of the spreading corruption?
Is it the denizens spreading out? Is it the power not being contained? Is it the Tower wanting to make the other 12?
Why are our hero’s likely to encounter weaker foes first?
There is no true control in the tower, disputes and the concentration of power has not happened yet, or there would be strong guards at the edges of it’s lines.
What Society exists on the outskirts?
there will be some society on the outskirts, mini warlords or gang leader types who got their crews out.
They may want to get their old turf back.
Be conflicted as they get weaker the further they are from their old home, but love the euphoria consuming life force gives them.
They unknowingly seek to construct another tower, but they don’t know what the draw to leave, survive, construct is…generations have been in the Tower, and have forgotten their true purpose.
Pulling the Carpet
This was the 4th Tower, 9 are fully constructed and operational, this one was responsible for building the last 4, but Azkol hijacked it for his own wants. The sorceress Hekyth, divined what tower is the Prime Tower…what does she want?
That Provides like 2000 hours of gameplay Well except for the details…