Learn TodayCore Guides
OpenDungeons

Open Dungeons RPG

Core Guides

Four books, one table. Learn the game today and play it tonight.

Start with the Core Guide Search the rules
Core Guide cover Book I Character Builder cover Book II Armor & Gear cover Book III DN Guide cover Book IV

Start here

Choose your path

Six short stops each. Every chapter you finish gets a check mark, on this device.

The whole game on one card

Six rules to remember

Attack d20 vs target AC No ability bonus to attacks. Armor Class 10 + Dex + shield A shield adds +2. Armor never changes AC. Damage Weapon + Str - DR Natural 20 ignores DR and deals x2. Save Roll d20 >= 16 - level TN 15 at level 1. Quick, Tough or Mind. Chance Roll d20 + bonus >= TN The DN sets the Target Number. Experience 100 XP per hour Level 2 at 2,000 XP, +2,000 per level.

The library

Four books

Book I Core Guide Learn in minutes, play tonight. 8 chapters · 15 min read Book II Character Builder Eight races. Four classes. Endless heroes. 6 chapters · 35 min read Book III Armor & Gear What you wear, wield and carry. 6 chapters · 20 min read Book IV DN Guide Rulings over rules. 13 chapters · 40 min read

At the table

Tools that use these rules

Character GeneratorRoll a hero in minutesDN & Player's ScreenTables at a glanceMonster Save Roll CalculatorSaves for any monsterEncounter Formula CalculatorBalance a fightMonster CreatorBuild a creatureStory Dungeon GeneratorInstant adventure seedsMagic Item GeneratorTreasure on demandSolo AdventureEchoes - play aloneReference ToolsSpells, monsters and moreAtlas of the InfiniteThe Realms Guide

Words of the game

Glossary

Tap any dotted word in the books for its meaning.

DNACDRDR PenHPTNSave RollChance RollProbability RollDex QuickCon ToughWis MindXPTurnRoundMagical BacklashWearyExhaustionDestinationTurn UndeadUnique AbilityLevel-Up BonusApex MortalCP, SP, GP, PP