A recent forum thread started me thinking about the “tensions” between a game setting and a game system. Specifically rulesets and worlds published by the same company (not like Peter’s use of FR for his RM game). Certainly Greyhawk and Forgotten Realms were designed to incorporate the full breadth of the D&D rules, but what issues are created when a game world doesn’t fully embrace the system it’s meant to support? MERP is a good example of this. The original modules used the RM rule set, but that rule set never really fit the low magic world of Tolkien. ICE eventually introduced MERP, which stripped out many of the professions to better fit the setting.