There will be some that will be rare. I'm sure some people will use their design experience to make rare poison too.

You are right in that the information on something this specific is a bit lacking at the moment, because yes, the game is still being worked on. From the information we have seen, you will likely be able to create an obscure poison like you described.

You should invent iocane powder. For reasons.

Just don't invent Sarin gas or you'll get tomahawks thrown at you.

I really like the pesticide idea. Also. The idea that you can specialize and stuff like that. Interesting stuff

Gotta remember too. If you make a poison in the desert and export it to another type of biome chances are any cure for it must come from the desert as well.

I had this cool scenario in my head where as an alchemist i was sort after to bring a cure to fix up the king who had become sick. Someone hit me up for a better offer to poison the king, and so i cired the king of his illness whilst releasing a slow but lethal poison. And the city ends frantically trying to save the king but the poison has been crafted by a master alchemist and was too hard etc

Sounds possible. Also sounds like a poor idea on that King's part to not have alchemical staff on hand to cross-check that medicine hehe.

The fun thing with a low-dose, slow-acting poison hidden in a medicine is that it'd be very difficult to figure out whether it's lethal without an advanced chemical analysis, which would be anywhere between very difficult and expensive to downright impossible in a medieval setting. Unless you already know said poison and got a standard test to prove whether it's there, but is that feasible for all available poisons?