Rulesets let a chat retune the game's rules as data — rest, combat math, spell DCs, XP, loot drops, difficulty, and more. Flip a knob below, watch exactly what changes versus base 5e, then export the JSON and import it in your game with /rules. Every rule you don't touch keeps its default, so a one-knob override is safe.
Each knob overrides one rule. Leave it on (default) to inherit the base value.
This is what you paste after /rules (or upload) in your game. Hand-edits here drive the knobs too.
Copy this guide, tell the AI how you want the game to feel, and it returns a valid ruleset you can paste above.