A proper command of terrain wins battles -- generals from Sun Tzu to Norman Schrwarzkopf have known this to be true. There's a similar relationship between encounter design and terrain -- a canny use of terrain can transform good encounters into great ones. One of the goals of the 4th Edition Dungeon Master's Guide is to help the Dungeon Master perform just such transformations, which includes providing a bunch of evocative terrain types and advice on their placement and use. Since the book doesn't come out for a while, let's illuminate some of the basics of terrain in 4th Edition Dungeons & Dragons.

While it might seem elementary, let's first examine what we mean by terrain. Terrain is not just what litters the field in an encounter; terrain also forms the dimensions and tactile experience of the encounter itself. Knowing that, there are some things about 4th Edition D&D design that you should keep in mind when building encounters.

First and foremost, not only does the standard 4th Edition encounter tend to have more combatants than in 3rd Edition, both PCs and monsters are more maneuverable as well. This means that the 10-foot by 10-foot rooms of yore have gone the way of the dinosaur (actually that happened in 3E, but that's not relevant to this discussion). Likewise have the 20 by 20 room and even the 30 by 30 room as the sole encounter areas. In fact, the minimum amount of space you typically want to have for a standard encounter is one of those large 10-square by 8-square dungeon tiles! That's 50-feet by 40-feet for all you still counting in feet. Just hold on before you start chucking all those 2-by-2 square dungeon tiles in the garbage -- you'll still need them!

Any DM worth her salt knows that dynamic and interactive stories are more satisfying than railroading narratives. The same is true for battle areas. Larger spaces with interesting terrain that both the PCs and their enemies can take advantage of -- or be foiled by -- is infinitely more fun than a small and relatively empty room that constrains combatant choice to a small set of dreary moves.

But here's the rub -- large areas of interconnecting chambers, complete with alcoves, galleries, and antechambers, are far more exciting than just plopping down a 10 by 8 tile and sprinkling it with rubble. Creating a network of interconnected areas creates numerous avenues of conflict and creates the possibilities for a series of evolving fronts that metamorphoses same-old encounters into tactical puzzles that'll sing like legend to a gaming group. See, you're going to need all those smaller pieces!

Then, once you have the main layout done, populate it with furniture, shrines, rubble, pillars, or maybe even the occasional lightning column or patch of doomspore where needed (and where appropriate), and you've got yourself a pretty vibrant encounter area for your combatants to interact with.

Oh, here's a bit of sound advice that'll keep you out of trouble. Be careful with pits and other steep inclines, and leave 100-foot (or endless) chasms for paragon- or epic-level play. Some of that increased maneuverability of the combatants in 4th Edition comes from attacks that can move foes against their will -- which is all fun and games until someone loses a character!

That aside, D&D is more than just a tactical skirmish game; it's also a game of storytelling and heroic adventure. When designing adventures, you're doing more than just placing interesting terrain pieces for the battle that (let's admit it) will most likely occur; you are also setting the stage of your story. A canny eye toward terrain set up can also help you communicate story elements to your players quickly and without the need to say a single word. Just put down some sarcophagi, and the players will know it's a crypt. Put down an altar, and you've just communicated that it's a temple. Put down piles and piles of bones in front of a yawning cavern, and the players will know their characters are likely in a world of trouble … or you've seen Monty Python and the Holy Grail one too many times.