Can't think of any media that comes close to my game idea.

I wan't and RPG where you are fighting enemies that have Wolverine levels of regeneration, I dunno maybe they are like aliens, or magical creatures or druidic things, but anyway the only way to effectively kill them is with poison.
The whole game is focused on using Toxins, Acids and Poisons. And then you have the logistics side of things, where do you get enough poisons? Do you harvest from natural sources? Have Alchemists produce them in a lab? Make pacts with magical creatures?
How do you best use them? Do you create traps and mines? Do you flood entire cities and valleys with poison? Do you poison the water supply?