Hey Everyone. I know it's been awhile since anyone has posted here but I have learned so much from this thread. That's why I would like to ask the one question I have left that I cannot seem to find any direct reference to. Can you use the Pathfinder OGL but make changes to the rule mechanics. EG: I want to develop a setting with modern rules but the classes don't lend themselves to the setting well. Thus I wanted to develop a new list of classes that would lend themselves to any setting. These classes would replace the current ones. Is that at all possible? I mean the classes still use the rule mechanics the same way. Can I take liberty and change rules like that or is the material I create limited to additional work that adds to the rules? Any info about this at all would be greatly appreciated. Thanks in advanced.