So as a intended poison crafter, I’d love the chance to unlock the ability to make either A incurable poison, or B an undetectable poison, I lean more towards the undetectable poison.
One where you may notice the effects of having been poisoned, IE our fatigue is rising faster than normal, but when using the investigation skill you can’t pinpoint exactly where it came from, was it the water? The food? Was it absorbed through the skin via contact. It would force folks to use process of elimination to determine the source which could add an interesting game play mechanic.
As for the incurable, I’d imagine it would act similar to a disease except once you die you won’t still be poisoned like a permanent debuff, but once infected it would be an inevitable death sentence. You could do things to prolong the fatigue drain and get to a safe place, but inevitably fall unconscious. once you die or the poison has run it’s course over a certain amount of time then that’s it. Those two crafting talents in the poison tree I find would be incredibly profitable for the first to be able to craft them.
Probably already thought of but there’s my two cents worth.