Add a New D20M Variant Rule
From D&D Wiki
Creating a New Variant Rule:
To make a new page for you own Variant, simply replace "VariantName" in the field below. Please leave the " (D20 Modern Variant Rule)" identifier. Then click the button and you'll be taken to an edit page. If an article already exists by the name you submit, you'll be taken to the Edit page for the existing article.
Note: If you are putting something on this site, and it is not your idea, please get permission from the author.