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Keywords are:  'advanced poisons dragonbanes insecticides herbicides'

These three advanced poisons can be brewed by thieves.  Each is
particularly potent against a specific type of creature, and repeated
poisoning can very quickly build to lethal levels.

dragonbane
Dragonbane poisons, which sometimes can be completely innocuous to humans,
are extremely poisonous and often lethal to nearly all kinds of dragons,
lizards, and drakes. It also reduces the power of draconic breath
attacks, making it especially potent when used in conjunction with the
asphixiation poison.

insecticide
Insecticides are particularly potent against insects, in particular nearly
all types of spiders.  It is also sometimes used in mild form as a topical
insect repellent when in the wilds.

herbicide
Herbicides are particularly potent against plants, including but not
limited to Ents.  If dealing with Ents on a friendly basis, it is best
to avoid open display of herbicides. The poison reduces the rigidity of
plant tissues, causing them to wilt and become more vulnerable to
physical attacks.