I’m adding a new Region type. “Swamp.”
Swamps give you access to both sorcery and poisons.
Making a poison is a Season action. The ven know many kinds of poisons. I count about 5. You’ll need to make one of those specific kinds of poisons.
Making yourself immune to a particular kind of poison… the ven immune system is pretty remarkable. You’ll have to spend a Season action making yourself immune to one of the five different poisons. Immunity lasts for one Season.
If you become poisoned, you gain the aspect “Poisoned.” You also die. The amount of time it takes for you to die depends on the poison type.
This also opens the “Poison Master” vassal. 😉