This question came out of another post on here of mine, so there may be some similarities. An answerer/commenter on that question suggested splitting it off, so here goes:

I'm a new DM, using Lost Mine of Phandelver to run a campaign. During the course of this adventure, I discovered what I deemed to be a plot hole, in that the path to Cragmaw Cavern is portrayed somewhat as being unsuitable for the wagon, yet the wagon is needed to move loot. This isn't the point, just background.

My solution was to say that "when you entered the clearing, you also saw another path which is wider and suitable for the wagon". My question here then is whether retroactively adding a feature is an acceptable/appropriate DM action. I know the DM makes the world, and DM word is law (to a point). But realistically, should the DM ever do this, go back and "correct" something in the past, or should they find another way to handle it?

My concern was that the PCs either wouldn't or couldn't find another solution, so I gave them an option. Is it okay to retcon like this?

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    \$\begingroup\$ I'm going to take the opportunity to remind answerers (and possibly closure voters) of how do we ask and answer subjective questions?. Not accusing anyone of anything, just a reminder. \$\endgroup\$
    – Someone_Evil
    Jul 14, 2019 at 16:09
  • \$\begingroup\$ I'm curious about something with this SE in particular: how exactly is the Answer feature supposed to work here? On StackOverflow, it's based on selecting the best answer, but as a lot of the RPG SE questions are more option based (like this one), there is no "right" answer. I've liked all these answers so far, they're all right in their own way and own situation. How am I to determine one is right and the others - inherently - wrong? \$\endgroup\$
    – Keven M
    Jul 15, 2019 at 17:22
  • \$\begingroup\$ Upvote good answers. The querent can accept one answer; the one that was most useful to them, or leave it blank, that's okay too. Also, for questions you have about the site (and other things) feel free to hop into our general chat. That way more (and more experienced) users have a better chance to see it. \$\endgroup\$
    – Someone_Evil
    Jul 15, 2019 at 18:31

4 Answers 4


The PHB supports what you did.

Ultimately, the DM's authority extends even to this.

Ultimately, the Dungeon Master is the authority on the campaign and its setting, even if the setting is a published world. (PHB, p 6)

But it's still best to discuss it with your play group

"Because I said so" does not always sit well with a given group of players. Whenever you retcon something in a game -- not just in D&D -- I have found that it is best to (1) discuss it with the players, (2) explain why, and (3) get their buy in. If they don't buy into it, you've got to consider "how important is this retcon to our continued campaign?" It is best to arrive at an agreement, or "get on the same page" before you start the next session.

Sometimes, we DMs and GMs fess up and tell the group: "eh, I think I made a boo boo there, here's how it works from this point forth. The gods were crazy that day."
Or something like that.

  • We ran into that in our group last Monday night. I allowed a player to cast sanctuary and firebolt in the wrong order (he should have gone firebolt/sanctuary to avoid sanctuary dropping from the attack) but since he's new to the class, and I knew what he was trying to do, and it was good for the party for him to do this, I said after the battle "Yeah, it worked out this time ... but remember, going forward, it is supposed to work like this {explained the mechanics}." We are on the same page.


  • retcon is a term often used to describe what you did with the retroactive change.
  • You may find this question and answer "Is the DM always right?" useful when dealing with some situations as the DM.

    On a humorous note: if the DM's wife disagrees with the DM, can the DM ever be right? grin

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    \$\begingroup\$ She just smiled and said no, so guess not. :) \$\endgroup\$
    – Keven M
    Jul 14, 2019 at 16:21

There are several related issues swirling around your question. Let me try to disambiguate them and answer them separately:

Can I Retcon?

Yes. You're the GM. It is fundamentally the job of the GM (in D&D 5e) to decide what the players see, sense, and experience about the game world, and it is fundamentally the job of the GM (in D&D 5e) to decide and determine what the world is

I'm unaware of a corresponding passage in the DMG (oddly enough) but the PHB states clearly on page 6:

Ultimately, the Dungeon Master is the authority on the campaign and its setting...

In D&D, this is nearly absolute, up to the limits of the players getting up and walking out of the game. It includes retcons, even though that is not strictly what that passage is talking about.

Should I Retcon?

This is a dicier question. Strangely enough, this time, it is the DMG putting the brakes on the situation, on page 4:

Consistency is a key to a believable fictional world.

This quote is not really addressing the issue of retcons directly, either. But it is easy to see how this applies-- a retcon, by its very definition (a portmanteau of 'retroactive continuity') is a break in the consistency of the game world you are creating or, in this case, directing.

The thing about retcons is, they can be very jarring for the players who experience them, and individual players and GMs have widely differing tolerances and reactions to them. I've seen players react very badly to even minor changes like this. In the worst cases, it trains them not to trust their senses as you narrate them, and jams their ability to decide what their characters think and feel about their own characters and decision making processes.

But I've also seen players (when they hear me muttering to myself about having messed up my own plan) offer to roll back and retcon a major combat encounter if it would help me out. (I was stunned.)

My best brief answer to the "Should I?" is, with great caution, don't wait very long to do it, and be upfront about it.

Can I/Should I... With Pre-Published Material?

Unless you're in a special situation like running a convention slot or are in some other way subject to an even higher authority than yourself as GM, it does not matter whether you retcon your own personally designed scenario in your own personally designed world, or if you are running something otherwise completely per print from a published adventure.

You're still the GM. You're still the authority. The same caveats about player reactions apply in exactly the same measure.

If an authority for this is needed, the full and complete quote from the PHB is actually:

Ultimately, the Dungeon Master is the authority on the campaign and its setting, even if the setting is a published world.

(Emphasis mine.)

  • \$\begingroup\$ I hadn't noticed that that would isn't in the DMG, but I'd be willing to bet that's an intentional omission. Putting it in PHB and not in DMG, it's telling the players not to question the DM, while avoiding giving DM's too large a sense of godhood (i.e. - I'm DM, I can do no wrong). Maybe not, but it does at least make sense logically. \$\endgroup\$
    – Keven M
    Jul 14, 2019 at 21:32
  • \$\begingroup\$ @kevenM I can see the reasoning behind that, but I come from a different tradition of writing where it would make sense to put both statements in both books. \$\endgroup\$
    – Novak
    Jul 14, 2019 at 22:07
  • \$\begingroup\$ In your "pre-published material" section, it may be worth considering that such changes to existing material may have unintended repercussions later depending on the change being made (though I doubt it'd matter much in this particular case). \$\endgroup\$
    – V2Blast
    Jul 15, 2019 at 4:14
  • \$\begingroup\$ @V2Blast You know, that's a good point. Let me ponder that, for the best edit. \$\endgroup\$
    – Novak
    Jul 15, 2019 at 4:42

You're allowed to retcon, although more nuanced solutions are usually preferable.

A retcon—retroactively changing something—is always within the DM's power in D&D. In one campaign I played in, the entire party was killed, and the DM rolled it back because it would have made for a disappointing ending to the campaign. You always have this ability, and there are situations when it's the best choice.

However, this power is usually kept in reserve for emergencies, for a few reasons:

  • It can undermine the players' sense of continuity in the world. It feels a little jarring sometimes to be told that you can't rely on your recollection of the game's events, or that something you achieved didn't happen after all, and so on.
  • It can feel unfair, since players may say, "If I had known about X, I would have done Y instead" or "If X had happened, I should have more hit points left", and so-on. You can end up with a chain of demands for do-overs, which is a very awkward mode to play in.
  • It feels like a violation of the "show, not tell" rule of story-writing. You ideally want the players to explore the world organically, rather than just have their past events dictated by the DM.

In this scenario, you did well to think on your feet and find a solution to a problem.

However, a more elegant method of retroactively introducing an element is to place it such that the PCs never saw it before until now, so that their past perception isn't inconsistent.

For example, perhaps the wider tunnel was hidden from the entrance and the player characters didn't see it on their way in. Or, perhaps its location is known to a helpful NPC, who shares it with them.

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    \$\begingroup\$ That's funny because I just said that to my wife, that I should have just made it "on walking out of the cave you notice..." \$\endgroup\$
    – Keven M
    Jul 14, 2019 at 16:54

A Divisive Issue

Whether or not significant retcons are okay is a thing about which people have differing stances. Some people see retroactive changes—ones of which the players weren't informed when the PCs should've spotted the relevant things—to be unacceptable due to depriving agency by way of denying the ability to react to the thing/opportunity/etc.. Others consider all methods fair so long as they make the story interesting. And of course what counts as making things interesting is subjective.

On a superficial level, it may seem that traditional games are more inclined towards a more 'stable' interpretation of the PCs' surroundings, and that indie games are more inclined towards accepting even drastic retcons. This in turn would make it seem that the D20 family of games, as the epitome of traditional games, would lean against retcons. But then again, Quantum Ogres are a D&D meme that is to a fair extent critical of a player who won't accept even a potential covert retcon (i.e. one which cannot be meaningfully proven unless the player is either telepathic or read the GM's notes). So, as they say, all crayons taste different.

Know Your Players

Either stance can lead to fun campaigns for the right 'target audience'. But it's important to know whether a given audience is in fact the target of a given way of handling such matters. E.g. if some or all of your players happen to want a very objective world where things don't change except as a result of in-setting events or actions of PCs and NPCs, then you may have a problem on your hands when such players notice a retcon.

So it's best to make sure you and the players are on the same page. Before a campaign, or, since you're already GMing, during some chat between sessions, try bringing up the subject and finding out what the players find fun. If your preference and the players' don't match (and both of you have strong preferences), you may need to either find a way to achieve a compromise, or consider a change of roster.

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    \$\begingroup\$ It is of some interest that the other question points out a unique feature of this play group: DM is DMing for his wife and kids. Not sure if you want to fold that into your detailed and thorough response. Family situations have a variety of different detailed social nuances that other gaming groups do not. Change of roster may not fit this situation. ;) \$\endgroup\$ Jul 14, 2019 at 16:24
  • \$\begingroup\$ @KorvinStarmast Sigh, and I thought the link to the other post is just for those who are curious about history, not a source of information that is central to the question. I answered based on the question body and title. \$\endgroup\$ Jul 15, 2019 at 6:18
  • \$\begingroup\$ I like the answer in terms of your objective to answer it generally. I just thought I'd let you know that for the specific case of this querent one of your suggestions likely doesn't fit their situation. \$\endgroup\$ Jul 15, 2019 at 12:15
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    \$\begingroup\$ I do not understand the down votes, to be honest with you. I was just pointing out something that I had learned in the linked / related question in case you wanted to address that. The "all caryons taste different" line alone makes this answer a good read. \$\endgroup\$ Jul 15, 2019 at 12:29
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    \$\begingroup\$ I agree, I like your answer, along with most of the others. And I didn't add the backstory because it isn't really relevant to the idea of the question. It does apply to me, but then I can rule that out (or consider it :p) as I see fit, but the general idea of "Is this good practice" works with or without that background. \$\endgroup\$
    – Keven M
    Jul 15, 2019 at 17:19

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