Last week: Running a Megadungeon Campaign in D&D 5E
Last week we covered darkvision and laid out the factors that make 5E insufficiently lethal for typical megadungeon play. Now lets discuss some solutions.
Tailor monsters to make them punch harder, but also die faster. Tweaking monster stats is categorically easier than getting PCs to buy into house rules that lower their own character’s powers. In addressing a common complaint with 5E that combat tends to drag on, I’ve found it helps a lot to make monsters hit harder, but be less tough. With some relatively modest adjustments, it is easy to cut an eight-round slogfest down to a tight three-round nailbiter. Monsters leave a bigger dent in PC HP totals, but PCs also have the satisfaction of taking them down before the battle gets boring.
Cap leveling up somewhere between levels 8 and 12. D&D 5E is tuned around the first two to three tiers of play. The second tier ends at level 8 and the third ends at level 12. The game is fun in the fourth and fifth tiers, but parts of it break down, and it is certainly not suited to megadungeon play. I ran several hundred sessions of 5E in a game that went from level 1 to beyond level 20, and while that campaign worked for location-based play at low levels (including quite a bit of time in the Caverns of Thracia), it was essentially obligated to transition to scene-based play at high levels.
A megadungeon campaign really needs to stay location-focused for its duration, and the easiest way to make that happen is to agree at the outset to cap the PCs’ level. You can choose where you want to cap the level based on which dungeon-bypassing powers you really want to limit. A series of posts from the early days of my blog attempts to catalog which 5E powers bypass dungeon obstacles at various tiers.
This will take some buy-in from the PCs, but make the case that it is required to run a cool megadungeon in 5E. Capping progress doesn’t even require an explicitly old-school perspective. The idea of “E6” D&D (which caps progression at level 6) came out of the crunchy 3.5 D&D world all on its own. And maxed out PCs can become powerful figures in the local area, engaging in domain-level play. If the players still aren’t convinced, a megadungeon campaign isn’t right for them anyway.
Limit where the PCs can rest. The average modern-style party will gravitate toward a simple gameplan: Fully unload on any antagonists they encounter, then pass out on the spot for eight hours. There's some variance based on group composition – a minority of classes in 2014 5E are optimized around short rests – but most 5E groups will have a majority of long-rest-oriented PCs like wizards and paladins who want a solid eight hours of sleep so they can once again go supernova on the next monster that looks at them funny.
You are going to have to disabuse them of the idea that it is OK to rest in the dungeon. For a lot of players, it’s going to take some convincing.
Out of character, tell the players that resting in the dungeon or the surrounding wilderness is highly dangerous. Have NPCs reiterate this in-character. Ultimately, the PCs will attempt it anyway, and you should adjudicate consequences firmly, demonstrating how hard it is to get a good long rest in the dungeon. Of course, if the players take clever precautions to secure a long rest in the dungeon, reward them.
Finally, if you don’t think this will be enough to motivate your players, discuss a house rule at session zero that long rests are simply impossible inside the dungeon. I’m trying to be conservative with the house rules here, but this one may be worth it.
Leverage time and antagonists against long rests. If resting in the dungeon isn’t practical, most PCs versed in modern-style play will pragmatically come up with an obvious fallback solution; retreat quickly to safety after every combat encounter. This is not really a bad thing; smart OSR PCs will keep avenues of retreat open as well.
But retreating after every fight will slow the game to a crawl. Fortunately, both old school games (strict time records and faction play) and story games (clocks and fronts) offer some tools to incentivize modern and trad players to play differently.
Establish antagonist NPCs and factions early, and then telegraph to the players how they are advancing their agendas every time the PCs take a long rest. It may help to present the PCs with antagonists right from session zero. A good example is the conceit used in Electric Bastionland and other games; have the party start with a shared debt they have to pay off. It could be one of the powerful factions in the town, or in the dungeon itself. The important thing is that the debt-holding faction both has a reason to be antagonistic toward the PCs and methods for creating time pressure.
Magic is ridiculously abundant to the point where you solve most of the normal OSR challenges with cantrips that half the party have.
I agree with this in a general sense. Cantrips are one of my least favorite parts of 5E, and they trivialize many parts of the game that old-school play emphasizes.
But the problem is really limited to a small subset of cantrips. The biggest use-case of cantrips is essentially providing a DPS floor for full spellcasters in combat. I don’t enjoy this design decision, but it fits with how modern play handles combat, and we don’t need to change combat much to empower the megadungeon experience.
The genuinely concerning cantrips are the ones that trivialize challenges outside of combat. If I was running a megadungeon in 5E, I would modify or rule out a few cantrips:
- Light and Dancing Lights would be the obvious ones to ban or nerf by “promoting” them to first level, per the discussion of visibility and darkvision in the previous post.
- Mage Hand should probably receive the same treatment, given how useful it is for manipulating traps and doors without risking oneself. It may still be worth the spell slot even if “nerfed” to first level. If a player is interested in the Arcane Trickster archtype (a rogue subclass), you may need to negotiate with them how to interpret this adjustment, as Mage Hand is baked into that archetype’s core powers.
- Guidance is not causing a problem for a megadungeon specifically, but it is bad game design, so I would probably ban it if I was cutting other spells anyway.
- Minor Illusion is a consideration, although strictly adjudicating it can denude it of its worst applications.
The rest of the cantrips in the 5E.2014 PHB are not really disruptive to megadungeon play. Non-cantrip spells are a resource expenditure question, and are essentially covered by the time pressure tools discussed above. Yes, having access to Fly or Dimension Door can subvert some dungeon challenges; but these are precious spell slots if we cap the PC's level somewhere between 8 and 12.
Yes, a 5E group is going to move through the megadungeon more quickly and suffer fewer casualties than an equivalent old-school group. But they're not going to trivialize a well-run megadungeon.







