Generic
Green Ronin’s multigenre adventure engine uses a single d20 and first appeared in the original Blue Rose before becoming an independent rules framework.
Directory entry · Green Ronin Publishing
Third-party modules welcome- Entry type
- Rules engine
- Rules family
- d20
- Edition
- True20
- Rules licence
- Multiple licences or conditions
01
What is it about?
True20 streamlines the d20 lineage for fantasy, science-fiction, horror and contemporary action adventures. Heroes combine abilities, skills, feats and powers. A shared core resolution mechanic and Toughness saves handle action and damage, avoiding traditional hit-point and experience-point bookkeeping while retaining character choices familiar to d20 players.
02
At the table
Build heroes suited to your campaign genre and resolve their actions with a d20. Their chosen capabilities and Toughness saves shape the available options and risks.
For module creators
Publishing modules
Independent sales
A public procedure exists for publishing True20 supplements and adventures under OGL and Green Ronin's trademark licence. Using that trademark requires submission of a signed agreement copy; it is royalty-free and requires no particular platform.
Conditions
Only printed/PDF books dependent on the rulebook, not standalone games; cover notices and credits, title restrictions and quality review apply. A signed contract is mandatory; individual modules need no prior approval, but the publisher may inspect them and terminate the agreement.
Permission and sources
03
Read the rules
Read the rules Licence sourceLogos and credits
Logos identify the games listed and belong to their respective owners. Inclusion in this directory does not imply affiliation or endorsement.
True20
True20 — Green Ronin Publishing.
Original logo design, resized for the web.