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I've not played The One Ring, but I have picked up the (D&D 5th edition OGL) RPG rulebooks for Adventures in Middle Earth - the One Ring stuff is slowly being converted to AiME by the company (Cubicle 7 Entertainment) that owns both franchises, so I reckon it will be updated and re-presented in a more modern format. Lots of source material and pretty pictures in the rule books, based mostly on the professor's writings rather than the films. I will be using them for a spot of RPG in the next year or two but will also mine it for ideas for GW's Middle Earth Strategy Battle Game tabletop, erm, game.