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Message: <blockquote data-quote="Gundark" data-source="post: 3957214" data-attributes="member: 6148">As we know there were a listing of WotC books that playtested certain concepts for 4th ed. But what about 3rd party books? On of the reasons for the existence of the OGL was that the d20 rules were supposed to evolve as new companies took interesting ideas and made them open source. The extent to which this took place is up for debate (and not the reason for this thread starting).There are little parts to 4th ed. that we saw in other 3rd party books.Here are some concepts from companies that first intro'ed future 4e concepts (or at least these are who I first saw them intro'ed by)- Spycraft intoduced the concept of rolling "criticals" on skills checks.Several other books intoduced the concept of per encounter spells (True 20).True 20 also introduced only having one attack a round (except for TWF).What are theories?</blockquote>