Properties of Worlds
Each world has four different aspects that combine to define its own unique
reality. These are chronology, magic, technology, and environment. Each aspect is
rated on a scale ranging from 2 to 20. Ratings can be generated randomly by
rolling 2d10. The lower the rating, the weaker the aspect is; ratings from 10–12
reflect conditions on typical AD&D campaign worlds. Though a rating of 10 is
weaker than a rating of 12 the differences between the two are imperceptible to
player characters. Ratings higher than 20 and lower than 2 are possible, but all
known planes fall within these extremes.
A world’s rating is usually fixed, but the ratings on some worlds shift slowly
over time. These shifts are so gradual that the residents don’t realize they
are occurring. An abrupt shift—even for the better—brings cataclysmic change to
a world.
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