Cultural notes for each species and some of the setting information embedded in the language table might have been worth a paragraph in the books dealing with these elements. The poisons table matches random names to various notional toxic substances and could have been more useful with a systematic treatment of effects and toxicity. The disease system, on the other hand, is just inaccurate and wrong (for the meaning of 'bubonic', please look up 'bubo', it's a moment's Web search). All in all, I'm unimpressed with the amount of useful content for the price of this well-padded instalment.