Dungeons & Dragons battlemaps are, by necessity, generally seen from a top-down perspective.  This makes tactical gameplay easy to conceptualize, but also, hinders the immersive potential of the image and (being selfish here) makes for an extremely boring angle to illustrate.

As a result, I quickly started to experiment with adding a map-wide one point perspective to the top-down angle.  There's a bit of clarity loss from a gameplay perspective, since now walls in perspective can encroach on the visual floorspace that characters will be moving around in—but I think the more engaging and relatable visuals are a fair trade-off for some awkward positioning during combat.

Here we have the absolutely gigantic final map of the campaign, which was host to the climactic final dungeon-crawl and ultimate battle for unimaginable riches.  I had a fair amount of artistic license with this map, so I decided to render it as though it were the location of an eons-abandoned subterranean magical university, filled with ransacked offices, rumbling lecture halls, empty dormitories, and the remnants of magical infrastructure.

The client wanted the final battle to take place in an enormous open shaft (allowing for a degree of verticality sometimes absent from D&D combat), which I decided would be some sort of ancient and long-defunct magical reactor used for research by the university.  Whether the players noticed that the many hexagonal columns shooting through the walls and floors matched the 'control rods' within the main shaft (implying some kind of cataclysmic reactor event) was never something I found out.  I'd like to think someone did.