Eu sugiro que você faça uma pesquisa na web; costumava haver netbooks compilados por fãs para esse tipo de pergunta. Em particular, temos o criador do cenário Forgotten Realms, Ed Greenwood (entre outros), fornecendo dados sobre as ervas de Faerun. Você pode ver alguns exemplos no seguinte tópico nos fóruns do Candlekeep: " Ervas nos Reinos ". Cito alguns dos efeitos mencionados nesse tópico aqui para acesso rápido:
... herbs that are nigh-irresistible (or in other cases abhorrent) to various races (orcs, dwarves, elves, gnomes, halflings), ...
... herbs, potions, and even diets and thorras (“teas” or more properly tissanes made by boiling the leaves of various plants; a “thorra” is the Realmsian term for purely medical-use drinks that aren’t primarily sustaining or pleasant to the taste) used across the Realms to try to increase chances of, or “ensure,” pregnancy. ... one of the most popular effective ones is the ... Realmsian herb “halvalondur,”
Merenthe: ... potent sleep-inducing drug that can bring “easy slumber” regardless of pain or nausea. ... works very swiftly, and when “passing off” causes swift awakening with little or no drowsiness. ... The secrets of its making are widely-known in Calimshan, known to a few in the Vilhon, the Tashalar, Amn, and Waterdeep, and little known elsewhere (where prices are high; typically 60 to 80 gp for a standard-sized potion vial, which if entirely imbibed at one sitting by an average-sized adult human male will cause about 5-and-a-half days of slumber).
Sarsson: ... has a strong peppery, lemony taste, and can be used to make foul water palatable (not safe, just more pleasant in taste) and to complement meat; it “enlivens” uncoagulated blood on contact to bring forth a vivid, strong taste that some creatures (such as giant striders and certain carrion birds, like gorcraws) find irresistible.
Tanglemoss: ... its name is derived from its firm adherence to underlying rock or earth, and hence its usefulness, ... Dried tanglemoss is used as packing and insulation, because it doesn’t crumble and disintegrate for more than a season after death, but it has no other known uses.
Glowmoss: ... absorbs heat and light energy, and glows softly in dim or dark conditions. ... Owners of glowmoss who understand its needs can readily illuminate a dwelling or structure by moving clumps of glowmoss from interior ceiling “light cages” to sunlit outdoor “reviving” locations, and back again, ...
Poções mágicas são geralmente muito mais potentes em comparação com esses efeitos. A produção de poções mágicas é um processo completamente diferente, exigindo materiais caros e tempo de pesquisa em um laboratório (ou um altar especialmente consagrado) para magos (ou clérigos) de pelo menos 9º nível. Os detalhes são fornecidos no Guia principal do Dungeon .
Sugestão pessoal da nossa própria mesa de jogo: O tipo de coisas que os remédios caseiros podem resolver em nossa vida diária deve ser possível através da proficiência de fitoterapia. Qualquer coisa que exija ciência moderna & medicina, tende a exigir magia no mundo dos jogos.