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Title: Excellent overall, but some minor compatibility issues
Review: Fiend Folio is an excellent supplement, with a wealth of new monsters, templates, and other goodies (such as grafts and symbiotes) that any DM can use to make a richer campaign. The only reason I didn't give it five stars is becasue it is 3.0 edition, so there are some minor incompatibility issues with 3.5 (the main thing I noticed was a few spell-like abilities not listed in the 3.5 Player's Handbook). So, if you are a stickler for such things, perhaps it is not for you. However, if you can put up with the minor inconsistencies, this really is a great source book overall!
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