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DELVE FIVE

The first four passes through this section of the dungeon had completely cleared out the anubian outposts on Level 1 and heavily decimated their forces on Level 2. I made the decision to allow this section of the dungeon to be temporarily cleared and dropped the chance of random encounters to one check per three turns.

This allowed the next group to pass through relatively quickly through largely abandoned chambers. They were once again tempted by the plaster-chipped door, but decided to pass it by when one of their veteran party members explained what the inscription said. Passing down to area 42 they encountered an ochre jelly (random encounter) who had taken up residence in the rubble pile and grown to a rather impressive size as a result of feasting on the dead rat corpses left behind by the last expedition. (This encounter nearly resulted in intra-party homicide when a particularly dim-witted knight couldn’t figure out that he was not helping matters by constantly hitting the ochre jelly and splitting it into smaller-yet-equally-vicious portions.)

They then continued south of this area, had several other adventures beyond the scope of this section (including rescuing an amazon warrior who had been frozen in ice for a thousand years), and then left.

(Nothing too exciting about this. If there is a lesson to be learned, it’s that you don’t have to cram in fresh content all the time. The importance of negative space — the absence of something to contrast its presence elsewhere — can’t be dismissed as a design principle.)

DELVE SIX

There was then a lengthy break in the campaign, which was marked in the game world by the pollen monsoon. When the PCs were able to return to the Thracian ruins, I spontaneously decided that an elementalist had moved into this vacated upper level. Accompanying him would be a number of lesser elementals.

And then, when the PCs kicked down the door to area 5, I found myself saying, “… sheets of malevolent flame dance around hearts of molten magma.” When the elementals died, they left behind smoldering, blackened pyrites. If they were struck with cold-based spells, I decided there would be a percentile chance that their magma hearts would explode from the sudden contraction (killing the elementals, but peppering the room with shrapnel).

So, those were pretty cool.

I also knew at this point that the anubians had re-fortified the guardpost in area 43, but the PCs didn’t make it that far during this session.

(This is our first major re-population of a deserted section of the dungeon. Couple things to note: First, I didn’t consult any repopulation tables. Why? Because I was struck by a cool idea. Random tables are tools, but I feel that you shouldn’t feel enslaved by their results.

Second, I’m not spending any time outside of the game prepping this repopulation. At the beginning of a session, I’m jotting down a few notes on how the dungeon has changed during the same time that the players are rolling up new characters, shopping for supplies, and the like. Of course, nothing says you can’t spend some time doing detailed prep work between sessions. But preserving the “I can play this any time” nature of your megadungeon means that you never want to feel like you need to do that kind of prep work before you can play the next session.)

DELVE SEVEN

When the PCs next returned to this section of the dungeon, I decided that the elementalist had been killed. (They discovered his flame-scorched body jamming the door to area 5 shut.) The reasons for this aren’t really important (and would be spoilers for my players), but this meant this section of the dungeon (along with 3 others) were depopulated.

I decided arbitrarily to check repopulation for each section by making a single 1-in-10 wandering monster check for each “section”. (The determination of “section” was essentially arbitrary on my part.) The check in this section came up positive, and I rolled on the Level Two wandering monster table (on the theory that some group from deeper in the dungeon had moved up to occupy these chambers).

The result was “giant spider”. There’s a minor spoiler here that I’m going to put into black text. My players shouldn’t highlight it, but the rest of you can do so to read it:

(On the second level of the dungeon there is a Shelob-sized spider that is described as having an egg sack of young spiders that’s ready to hatch. I decided that the egg sack had hatched, and some of the young spiders had migrated to this upper level.)

In any case, I decided these giant spiders had moved into the bat chambers. They had strung their webs and were basically feasting on the bats (whose population had been significantly depleted).

The PCs’ first inkling that something was wrong came when they found the giant spiderweb draped across the staircase leading down to area 2. After they had cleared out the spiders, they found the elementalist’s scorched body, verified that the rest of this section was still deserted, and then moved down to the second level where they engaged in multiple, semi-futile skirmishes with the anubian guardpost (which I had repopulated before the previous session).

(Here we can see how random tables can provide the raw seeds that you can riff off of to develop the megadungeon in interesting ways. This kind of improvisational extrapolation from a simple table entry of “giant spiders” is what makes the campaign come alive.

The wandering monster table is like the audience members who yell out suggestions on an improv show: Simply yelling out “mime” and “airplane” doesn’t make for a comedy show; it requires the improv actors to create a sketch about a mime pilot making an announcement over the plane’s intercom system for that. Similarly, just having random “giant spiders” attack the PCs because the table says so doesn’t make for an adventure; what you need are giant spiders in a particular place for a particular reason and doing a particular thing.

Why use the table at all? For the same reason the improv actors use audience suggestions: It keeps you fresh. It forces you to think outside of your comfort zone. It can give you an idea where you’re drawing a blank. Perhaps most importantly, it’s fun.)

A FEW FINAL THOUGHTS

At several points during the writing of this essay I found myself thinking, “This is really boring. This is just me giving a litany of fairly simplistic events.”

But maybe that’s the point: There really isn’t any magic here. You keep the dungeon alive by using wandering monster encounters to simulate the activity of the complex. You partially repopulate the dungeon inbetween sessions to keep it fresh. The result is that you can take 10 encounter areas, a couple of tables, and get dozens of hours of play out of it.

With that being said, if these 10 areas were the only section of the dungeon available none of this would work. First, the PCs would be able to “clear” the dungeon and there would be no immediate motivation to return. I could, obviously, repopulate such a dungeon and remotivate them to come back (“the draconian scouts have established their advance base in the same abandoned mines used by the orcish raiders!”), but there would be a greatly reduced sense of building on past successes or contributing to a single, larger goal.

Second, in the megadungeon the PCs aren’t being forced to go back over the same ground. They’re choosing to come to this entrance of the dungeon instead of another. This is important for both tactical and psychological reasons.

But, laying those caveats aside, my biggest point here is the ability to effectively reuse and refresh the megadungeon. This material can be used and re-used many times over without becoming stale. And if it ever starts to become stale, it’s a relatively trivial matter to freshen it back up again: Lizardmen invade the complex from the nearby swamplands. In a mighty, magical earthquake a new ziggurat pushes its way out of the earth leading to an entirely new complex connected in yet unknown ways to the caverns beneath. The black-eyed cultists approach some of the heroes to form an alliance against the aggressive anubians. And so forth.

In many ways, I feel like a megadungeon becomes the DM’s character. And I play my megadungeon much like I would play a PC. Before play begins, I don’t really know what my megadungeon is going to do: But my random encounter tables generate 2d4 anubians just after the PCs raid the depths, and I know the anubians have sent a team of assassins to hunt them down. Black-eyed cultists are holding a ritual on Level 2 and I suddenly know the sin day they’re celebrating. Lizardmen show up in the anubian sections of the dungeon and I know tensions are erupting between their tribes. Then the minotaur shows up to determine why tribute is not being paid and… and… and…

And a story gets told.

Go to Part 3: The Players Take Charge