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Message: <blockquote data-quote="Morrus" data-source="post: 6714033" data-attributes="member: 1">Just don't use anything that WotC wrote that isn't in the 3.x SRD, follow the terms of the OGL, and you're fine.  You'll find that most of the terms you need to write for the current iteration of the game are in the SRD for 3.x. Make doubly sure by not mentioning the game or company by name, and make sure you don't copy their layout or trade dress. Basically, don't use any of their IP, including terminology, art, trademarks, logos, titles, etc. unless they've given you permission to (as they have with the OGL and SRD with very large number of terms).  Remember that the OGL does not allow you to use any trademarks (any at all - not just WotC's) without written permission from the trademark holder.WotC won't give you legal advice, and neither should they, so there's no point asking them.The short version: use the OGL. You can use any text from the 3.x SRD; you cannot use any text not in the 3.x SRD, unless you write it yourself.  The answer to any "Can I use X?" question is "Is it in the 3.x SRD?"Here's the OGL (it's fairly simple):<a href="http://opengamingcontent.com/open-gaming-license/" target="_blank">http://opengamingcontent.com/open-gaming-license/</a>Here's the 3.x SRD:<a href="http://opengamingcontent.com/revised-v-3-5-system-reference-document/" target="_blank">http://opengamingcontent.com/revised-v-3-5-system-reference-document/</a></blockquote>