A post on the 3d6 Down the Line Discord expressed skepticism that the Arden Vul megadungeon could be run in D&D 5E.
And I get it. D&D 5E would not be my first choice for a megadungeon either.
But I have run a lot of 5E with an OSR mindset, and I believe I could run a megadungeon in 5E with (relatively) modest house rules and campaign assumptions, if for some reason I decided to do so.
All points below are in the context of the 2014 5E rules. I do not own the new 5E books, but understand they do not deviate far from the 2014 rules, so I expect this approach would broadly work there as well. I also anticipate that most of the same ideas would apply to the 5E-compatible systems that have come out since 5E was released into the Creative Commons.
Below are the four issues that the post identified, addressed in turn.
Everybody Has Darkvision
I agree that darkvision is over-prescribed in 5E, and that darkvision can undermine old-school exploration by removing the question of visibility. But a serious part of the problem is that a lot of players and DMs don’t even follow 5E’s rules as written, and assume that darkvision is a more potent ability than it actually is.
D&D 5E’s rules allow creatures with darkvision to see in darkness as if it were dim light. That means disadvantage on Wisdom (perception) checks and an inability to see colors. Darkvision is better than nothing, but it is no substitute for a proper light source, particularly when checking for traps or keeping an eye out for secrets and treasure. I also remind players that whenever they are within the area of a source of light – whether from an ally, the environment, or an NPC or monster – that light prevents the use of their darkvision until they move out of the light. When I explain all of this to 5E players, they often choose to use light, even if they don’t “need” to, treating darkvision as more of a plan B, or an option for stealthing apart from the group.
Monsters face the same limitation. Whether an intelligent monster decides to rely on darkvision or use light typically reflects its level of confidence in its place in the dungeon hierarchy. Those confident in their control of the space use light. Those fearful of discovery favor the darkness.
Of course, an intelligent monster with 120’ darkvision will rely on the darkness more often than a creature possessing typical 60' darkvision, because it expects that it will have an edge. Creatures with tremorsense, blindsight, and similar abilities actually can functionally “see” in darkness as well as they can in light, so they do work in the way that many players think darkvision works. Creatures with those senses actually will completely skip light, for the most part. This makes them significantly scarier opponents in their native environment than creatures with mere darkvision.
If I was going to go further in houseruling this issue, I would take darkvision away from elves, and leave it to just the gnomes, dwarves, and tieflings. But even without altering the ancestry rules, darkvision can be brought into check simply by following the rules as written strictly.
It’s Impossible to Die in 5E
Let’s start with two easy caveats. First, simply removing 5E’s playculture presumption of level-appropriate encounters solves part of this problem. Even the most optimally constructed low-level 5E characters are not going to last long if they arrive at Arden Vul and beeline for the lair of Craastonistorex, the old and powerful green dragon. Once the players realize that difficulty is dictated by where they go and what they do – not what is appropriate for their current level – they will act more prudently.
Second, at very low levels, the problem isn’t really that pronounced anyway. Low-level PCs in 5E are much tougher than B/X or OSE characters, but they can still go down after just a few hits. The death saves system usually gives them a few chances to survive, but a deadly dungeon can kill many PCs outright through massive damage from falls and traps. In combat, monsters can also opportunistically focus on downed characters and quickly finish them off. Remember that any source of damage to a character on death's door equals a failed death save. Lowly goblins or kobolds become much scarier when they drag a downed PC away into the darkness, rather than “fighting fair” and engaging the PCs who are still standing.
But beyond those two caveats, I acknowledge the issue OP raises. At about level 5, 5E PCs get a lot stronger, and they don’t slow down from there. PCs in 5E at middle to high levels create a series of interrelated issues for DMs who want to run a megadungeon game that cares about exploration, time, and resources. I believe there are at least four interrelated issues that cause problems here:
- 5E PCs have massive amounts of HP
- 5E PCs have a lot of resources to replenish HP
- Both play culture and player powers make it unlikely that PCs will get lost, captured, or otherwise separated from safe locations where they can rest and recover
- Modern play culture presumes little or no time pressure, so choosing to rest does not come with an inherent cost
A few different adjudication techniques and house rules can solve a lot of these problems. We'll cover those next week.
Next week: Death, Magic, and Cats
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