General: They are just hungry beasties, nothing nightmare oriented about them!
A: It would not work since nightmare energy works differently from poisons. Using nightmare energy would instead make the poisons more potent with strange, negative side effects (imagination roams free on those). The "anti-" nightmare energy would just be normal dreamotion energy.
B: Yes, but they would need to be able to construct such a talisman and that will more likely require dreamotion. Fae magic is also an option, but dreamotion is the safer bet.
B2: In this case it might be possible, though not without consequence. One would need to have trained up to be able to control nightmare energy to be able to concentrate it to destroy the poison, and that will take much longer than trying to control dreamotion energy due to how volatile nightmare energy is. Otherwise, the nightmare energy will distort and worsen the poison's effects instead.
Re: the snoyote venom
A: It would not work since nightmare energy works differently from poisons. Using nightmare energy would instead make the poisons more potent with strange, negative side effects (imagination roams free on those). The "anti-" nightmare energy would just be normal dreamotion energy.
B: Yes, but they would need to be able to construct such a talisman and that will more likely require dreamotion. Fae magic is also an option, but dreamotion is the safer bet.
B2: In this case it might be possible, though not without consequence. One would need to have trained up to be able to control nightmare energy to be able to concentrate it to destroy the poison, and that will take much longer than trying to control dreamotion energy due to how volatile nightmare energy is. Otherwise, the nightmare energy will distort and worsen the poison's effects instead.