The concept of a book which describes how to create creatures for your specific setting has been done; it's called the Monster Burner for the Burning Wheel system.
Not only does it point out how to integrate the specifics of your new critter into the the gamescience, but it gives tremendous weight to the role it plays in the setting. Quite an innovative book, if a bit story-game oriented.
A book of lists of monster stats? Not so interested...
A setting book with the creatures found wandering this specific countries' lesser worn trails? Much more interested...
-pax-
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Running: BRP UnderOerth - "Shards of the Master"
Writing: collecting notes for a new near-future setting
296/420
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