The Praxic Compendium is a collection of elements from and for tabletop roleplaying games - cycles of play, ways authority can be divided, dice-rolling conventions and outputs, possible bonus types, ways that game prep might be done, and so on.
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"This has been out for literally, like, a day and I think I've already recommended it to like six designers I know. Absolutely essential reference guide for TTRPG design"
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The Compendium is a close relation to the Deck Of Rules, and includes everything found therein, in more screen-readable format, but also includes further material that doesn't fit with the general use of the deck.
This is also a living document - It might sit fallow for years, get updated monthly, or anywhere in between. If you have suggestions for things which ought to be included, drop them in the comments!