Session Prep
Running a session with zero prep
Five improv structures for the week you didn't have time to plan.
Read the guide →The ultimate resource for dungeon masters
Everything you need to run a legendary campaign
Dungeon Master Portal brings campaign management, encounter building, NPC generation, maps, and a searchable rules library into one calm, fast workspace — so you can spend less time prepping and more time at the table.
40+Free DM tools & generators
2,500+Rules, monsters & items indexed
100%Usable at the table, offline-friendly
Quick start
Everything a Dungeon Master needs, in one place
Jump straight into the tools you'll reach for every session. Each one is built for speed at the table, not just prep at your desk.
Campaigns
Campaign Manager
Organize arcs, sessions, and party decisions in one continuous timeline.
Open tool →Combat
Encounter Builder
Assemble balanced fights with live difficulty scoring for your party.
Open tool →Characters
NPC Generator
Generate names, motives, and voices for NPCs in seconds, mid-session.
Open tool →Worldbuilding
World & Maps
Build regional maps with linked locations, factions, and lore notes.
Open tool →Prep
Session Notes
Capture recaps, secrets, and hooks that autosave as you type.
Open tool →Reference
Rules Library
Search official-style rules, monsters, and items without leaving the table.
Open tool →Built for the table
Not just a wiki — a toolkit you run the game with
Every tool is designed to survive a real session: fast to open, easy to scan, and forgiving when the party goes off script.
Initiative Tracker
Drag-to-reorder turn order, condition tags, and one-tap HP adjustments.
Random Generators
Names, taverns, weather, rumors, and plot hooks whenever you need one.
Homebrew Compendium
Publish and organize your own rules, monsters, and magic items.
Loot & Treasure
Level-appropriate treasure tables that keep rewards fair, not random chaos.
World Atlas
Link regions, factions, and NPCs so your setting stays consistent.
Printable Handouts
Export player-facing maps, letters, and clues styled for the table.
Library
Browse the rules library
Search rules, monsters, and items by name, type, or source — filters stay visible so you never lose your place.
Monster
Ashfen Bog Hag
CR 4 · Swamp lurker with lure and curse abilities.
Item
Lantern of Quiet Steps
Uncommon · Muffles footsteps within its glow.
Rule
Chase Complications
Optional rule · Adds tension to extended chases.
From the grimoire
Guides and tips from working Dungeon Masters
Short, practical reads from the community — no long fantasy metaphors, just things you can use tonight.
Combat
Making low-CR fights feel dangerous
Terrain, morale, and reinforcements that raise the stakes without raising CR.
Read the guide →Worldbuilding
A faction map in twenty minutes
A fast template for factions, goals, and the friction between them.
Read the guide →Questions
Frequently asked questions
Yes. The core toolkit — campaign manager, encounter builder, NPC generator, and rules library — is free. Premium adds unlimited storage, offline maps, and early access to new tools.
Dungeon Master Portal ships with a system-agnostic rules structure and starter content compatible with most tabletop fantasy systems, plus full homebrew support for your own rules and stat blocks.
Premium members can save maps, handouts, and reference pages for offline use, so a spotty venue connection never stops a session.
Yes. Every DM can create and organize homebrew rules, monsters, and items, and choose whether to keep them private or share them with the community.
Ready to prepare your next session?
Create a free account and open your first campaign in under two minutes.