7 Common Mistakes New Dungeon Masters Make (And How to Fix Them)

26 March 2026

Running your first campaign is one of the most rewarding things you can do in tabletop gaming. It’s also one of the most nerve-wracking. The DM is responsible for the world, the story, the NPCs, the rules, and the pacing—all at once.

Most first-time DMs make the same handful of mistakes. Here they are, and how to fix them quickly.

1. Over-preparing the story

New DMs often spend hours building out an intricate plot—only for the players to go in a completely different direction in session one. All that prep feels wasted, and the temptation is to force the story back on track. That’s railroading, and players feel it immediately.

Fix: Prep situations, not stories. Who wants what? What happens if the players do nothing? That’s your session. Let the players drive into it however they like.

2. Saying “no” when you should say “yes, and”

Improv theatre has a principle: accept what’s offered and build on it. New DMs sometimes shut down player ideas because they don’t fit the prep, or because the rules don’t technically support them.

Fix: Default to yes. If a player wants to do something creative and it makes the scene more interesting, find a way to make it work. The rules are a framework, not a ceiling.

3. Fudging dice rolls constantly

Killing a character with a bad roll feels harsh. So new DMs quietly fudge the numbers to keep everyone alive. A few times this is fine. Doing it constantly removes all tension—and players notice.

Fix: Roll in the open when it matters. Let consequences exist. A near-death experience—or even an actual death—can become one of the table’s favourite stories. Protect the stakes.

4. Forgetting that the players are the main characters

It’s easy to get attached to your world, your NPCs, your villain. But the story isn’t about them. It’s about what the players’ characters do.

Fix: Ask yourself before each session: “What do they want? What challenge puts them in the spotlight?” Your NPCs are supporting cast. Serve the players first.

5. Treating every rule violation as a crisis

The Player’s Handbook is 320 pages. Nobody knows every rule perfectly. New DMs sometimes freeze or argue when a rules question comes up mid-session.

Fix: Make a ruling, write it down, look it up after the session. The table will respect a confident “I’ll make a call now and we’ll clarify later” far more than a ten-minute rules debate that kills the mood.

6. Not giving players enough information

Dungeon Masters control all the information in the world. New DMs sometimes hoard it—keeping descriptions vague so players “discover” things. The problem: players can’t make interesting decisions without information.

Fix: Describe the scene actively. Tell them what their characters would notice. Give them something to do with the information. Vague doesn’t feel mysterious—it feels frustrating.

7. Not checking in with players outside sessions

You can spend hours building the perfect campaign and still have a player who’s quietly not enjoying themselves. New DMs assume everything is fine unless someone complains loudly.

Fix: A quick message after session one: “What’s working? Anything you’d want more or less of?” That single question prevents ninety percent of long-term campaign problems.

The short version

Prep less story, say yes more, roll in the open, serve your players, keep the game moving, and ask for feedback. You won’t be a perfect DM at session one. Nobody is. But these habits will make you a good one faster than you’d expect.