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An exploration of old school and modern rules and methods

Modern OSR focuses on empowering the Referee to be able to resolve situations by narrative judgement through an open rules framework. At the table this promotes storytelling and creative problem-solving. There are a few principles to help encourage and foster imaginative thinking at the table.

  • Rulings over Rules
  • Agency of Action
  • Broadcast Danger
  • Clear Perception
  • Problems Not Solutions
  • Random Fate
  • Embrace House Rules

Vision for Modern OSR

  • Elegant simplicity over crunch
  • Embrace: Rulings over Rules, Supply Problems Not Solutions, and House Rules
  • Effortlessly slide into any setting - default to OSR concept
  • 8 Parts: Core Rules, Character Creation, Goods and Services, Referee Rules, Spells, Magic Items, Monsters and Appendix
  • Five tiers of play (every 4 levels) low/mid/high here - epic/mythic later
  • Numbers in the scale of classic OSR
  • Hit Dice and Damage Dice are all static ½ die
  • Use just Ability modifiers
  • Use ability, attack and save checks with a default difficulty value of 12
  • Advantage/disadvantage +/-2
  • Four core classes and multiclass as six more classes
  • Spells written by tiers and most available to mage with cleric picking based on domains
  • Monsters are templates


This is a work in progress. It is 80% done and playable.

AI was used to develop images. I do not advocate or condone its use.


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Click download now to get access to the following files:

Modern OSR 2025 Draft1.pdf 113 MB

Development log