The DM Prep Checklist: What to Do in the 48 Hours Before Your Session

You've got a session on Saturday. It's Thursday night. Are you ready?

If you've ever shown up to a D&D session with half-formed notes, a villain whose motivation you forgot, and absolutely zero idea what happens after the players inevitably go off-script — this guide is for you.

Great D&D sessions don't happen by accident. They're built in the 48 hours before everyone sits down at the table. This checklist breaks down exactly what to do, when to do it, and how tools like MythWeaver can help you do it faster without sacrificing quality.

48 Hours Out: The Big Picture Decisions

Two days before your session, your job is to set the stage. Don't get lost in details yet — focus on the shape of the session.

✅ Review where you left off

• Re-read your last session's notes or summary
• Identify unresolved threads: cliffhangers, player promises, NPC loose ends
• Ask yourself: "What are the players most likely to pursue next?"

✅ Define your session's throughline Every session needs one clear dramatic question. Not a list of encounters — one question the session is about. Examples:

• "Will the players figure out the steward is the traitor before it's too late?"
• "Can they convince the council without resorting to violence?"

If you can't write that question in one sentence, you're not ready to prep the details yet.

✅ Identify your 2–3 key scenes Not everything needs to be prepped. Pick the 2–3 moments that must happen (or that you want to happen) and prep those with care. Everything else, you can improvise around a solid core.

✅ Flag what's missing What NPCs do you need? What locations haven't been described? What lore questions might players ask that you don't have an answer to? Make a list — you'll fill these in tomorrow.

24 Hours Out: Fleshing Out Key Scenes

Now you get tactical. You know what the session is about. Now make it real.

✅ Prep your key NPCs For any NPC the players will meaningfully interact with, know:

• Their name and rough appearance (3 words: "tall, nervous, ink-stained fingers")
• Their goal in this scene — what do they want from the players?
• Their secret — something they're not saying
• Their tell — one physical or verbal habit that makes them feel alive

Resist the urge to over-prep. You don't need a backstory novel. You need enough to play them convincingly for 10 minutes.

✅ Sketch your key locations For each major scene location:

• One evocative description (2–3 sentences, all 5 senses if possible)
• Notable features players might interact with
• Any hidden elements you want them to discover

✅ Prep your encounters If you're running combat:

• Enemy stats loaded and accessible
• Initiative and HP tracking ready
• At least one environmental complication (a chandelier, a crumbling floor, a hostage)
• An "out" — how might this encounter end without a TPK if things go south?

✅ Prep your transitions How does one scene lead to the next? Even a one-line "if the players do X, then Y" for each major scene will save you mid-session brain freeze.

Day-Of: Final Passes and Contingencies

The morning or afternoon of your session. Light touch — this is polish and peace of mind.

✅ Read your notes once through Just read. Don't revise. Get it all in your head. This is your mental rehearsal.

✅ Prepare your go-bag Even with a tight script, players will surprise you. Make sure you have:

• 3 throwaway NPC names (all genders)
• 2 minor location descriptions you haven't used yet
• 1 wandering encounter you can drop in anywhere
• 1 faction rumor or piece of world lore to share if conversation runs dry

✅ Set up your tools

• Session notes open and accessible
• Dice, tokens, maps ready
• Music playlist queued
• Any handouts prepped or printed

✅ Give yourself 10 minutes of quiet Seriously. Sit, breathe, and remember why you love this hobby. A calm DM runs a better session than a stressed one. You've prepared. You're ready.

The Go Off-Script Kit (NPCs, Locations, Hooks You Can Pull On Demand)

No matter how well you prep, players will do something you didn't plan for. That's not a failure — it's the whole point. The trick is having a toolkit ready so improv feels intentional.

Keep a running list of:

• 5–10 NPC names with one-word personality notes ("gruff, loyal, hiding something")
• 3–4 generic location skeletons ("abandoned warehouse," "river crossing," "noble's manor") with sensory hooks
• A handful of open-ended quest hooks that fit your campaign's tone
• One dramatic revelation you've been holding back for the right moment

MythWeaver's campaign tools let you build this kit as part of your world, so every improvised NPC actually fits your lore, and every "random" location has connective tissue to your story. The difference between good improv and great improv is having good raw material on hand.

How to Cut Prep Time in Half with AI

Here's the honest truth: most DMs aren't bad at prep. They're just slow at it, because the tools are bad.

Writing NPC descriptions by hand takes 15 minutes. Describing locations you've already described three times in slightly different ways? Tedious. Tracking which clues you've given and which you're still holding? Exhausting.

MythWeaver is built specifically to solve this:

• NPC generation with memory: Create NPCs that automatically remember their history with the players, their stated goals, and what they've been told — so you never have to flip through old notes mid-scene.
• Lore-aware content: Because MythWeaver knows your campaign, generated content doesn't contradict your world. No more generic fantasy fluff that doesn't fit.
• Session recap tools: Auto-generated or AI-assisted session summaries that become the foundation for next week's prep.
• AI character portraits: Visualize your NPCs instantly with AI-generated art through our Artist Models program — featuring work from real fantasy artists, so you're supporting the community you love.

DMs who use MythWeaver report cutting their average prep time from 3–5 hours down to 45–90 minutes per session. That's time you can spend actually playing — or just sleeping like a normal person.

Free Downloadable Checklist

Here's the whole thing in one place:

48 Hours Out

• Review last session notes
• Write your session's dramatic question
• Identify 2–3 key scenes
• Flag missing NPCs, locations, lore

24 Hours Out

• Prep key NPCs (name, goal, secret, tell)
• Write location descriptions
• Prep encounters with a complication and an out
• Plan scene transitions

Day Of

• Do a single read-through of your notes
• Prepare your go-off-script kit
• Set up all tools and materials
• Take 10 quiet minutes

Ready to Prep Smarter?

Great sessions come from great prep — but great prep doesn't have to mean more prep. It means prep that's targeted, lore-consistent, and efficient.

MythWeaver gives you the infrastructure to prep like a professional storyteller in the time you actually have. Try it free →

Have a prep ritual of your own? Drop it in the MythWeaver Discord — we're always comparing notes.