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Message: <blockquote data-quote="jmucchiello" data-source="post: 1556852" data-attributes="member: 813">In this context, , it is quite simple: He doesn't want to include a stat block in the adventure. If he uses someone elses critter, he has to include the stat block. He can't just say, go look them up in Fred's Guide to Undead because his module becomes useless to people lacking FGtU. (I'm assuming Fred doesn't mind him claiming compatibility with FGtU which is also not allowed under the OGL without permission.) After all, if he's stuck making a stat block he may as well create a new creature so that his adventure is 100% new material, not 80% new material. Some people hate buying the same material twice.In the general context, the problem really is numbers. When I say the mage has magic missile prepared, you know that you can just go to the PHB and look up the particulars if you aren't familiar with it. If I say the mage has Grar's Missile of Magic prepared, I also have to tell that Grar's spell appear in such-and-such a book. Now I'm fairly certain that the cross-section of gamers with PHB and gamers buying my book is the set equal to gamers buying my book. However, the cross-section of gamers with Grar's Grimoire and gamers buying my book is not equal to gamers buying my book. In fact it is probably significantly smaller. Orders of magnitude smaller. Why should I limit the value of my book only to those who have Grar's Grimoire and the PHB when I can limit it those with the PHB alone? Adding another 3rd party title shrink the cross-section even smaller.OTOH, you might say I could include Grar's Missile of Magic in my book so they don't have to own Grar's Grimoire. Now I have the situation where I cannot say my book is all new material. I now annoy those people who own both my and Grar's books because now they have that spell in print twice. As I add more 3rd party material to my book, the amount of new material falls and the likelihood of intersecting between spells in my book and spells in books already owned goes up. In fact, the odds of the buying having the other book are probably higher than in the population of two unrelated books. The buyer bought my book presumably because of the topic. I took the spell from the other book because it fit my topic. This means the topic of the other book is more likely useful to the buyer of my book and thus it is more likely that he has the other book.Lastly, there's always Not Invented Here syndrome. But that's not really part of this topic, is it?</blockquote>

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