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In page The Fantasy Trip:

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Jackson left Metagaming in 1980. By that time, Howard M. Thompson, the owner of Metagaming, was not happy with the TFT work done by Steve Jackson, stating that it was too complex and had taken too long.[1] To address some of these concerns, Thompson partially revised the TFT mechanics for Dragons of the Underearth, a compact set of fantasy role-playing rules derived from Melee, Wizard and ITL, with simplified rules for combat and magic, and the related The Lords of Underearth mass combat system.