I've read only one Kane novel, Dark Crusade, and it provided a number of ideas to help populate my campaign:
1. I want to create a number of "freelance NPCs", basically rival adventurers who can serve as foils to the characters' plots. Think of it as semi-character driven sandboxing.
2. I've designed a series of gates throughout the region that allow rapid transport across the area, turning a week-long trip into a one day excursion.
There is, of course, a catch. I don't like the Star Trek/science fiction-esque feel of a teleportation transit system. It's too cold, clinical, and technical.
Instead, these passages are called the Gates of Death, and for good reason. When the gods and titans warred over the world, it was only partially completed. Here and there, titanic and divine creatures still labored over the world. The world spider was one of these creatures. It and its brood wove the firmaments of time and space.
The Death Gates are areas where the world spider and its children still lurk, realms where time and space run at odd angles. To a mortal, this lets you take a journey of 100 miles in 50 steps. Nice, isn't it?
Sadly, the world spider and its children are trapped within the gates. They've gone mad over the eons, as they are trapped within creation while the gods and titans are consigned to the planes. Thus, while a journey through the Gates is but 50 steps, it is 50 steps of pure, maniacal, panic as a horde of eons old spider demons rushes after you.
Legends hold that the world spider has lost track of the extent of its domain. Passages twist and turn, leading to chambers and realms untouched since the dawn of time. Further legends whisper that, hidden within that awful maze, are doorways that contain the treasure troves of gods, lands where gold grows from the soil like grass, and a library in which every single truth of the world is kept hidden.
So, that's how I'm handling gates in my campaign.
Kane's adventures also prompted a few other ideas, but I'll get to those in future posts. If you have a chance to read any of the stories, I highly recommend them.