... and they really did just steal all of this for D&D.1 I reached the point of Elric of Melnibone where he just strides right into the 4e Shadowfell. And that's probably the least of things taken.
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Yeah, look, I know there was some tighter link between TSR and Moorcock at some point, enough that early printings of Deities & Demigods included Elric characters. But it's one thing to know that trivia and another to read the stories and go "Oh. This is just D&D for the next 50 years, huh."