I have a character who has injuried resulting from torture. he uses a medicinal herb to relieve the resultant pain.
He wishes to poison two people by adding something to their wine so they are paraylsed or otherwise unable to stop him from stabbing them.
Ideally, I'd like the poison to be quite fast-acting (minutes) in it's first symptoms. One of the two men has to die and the other needs to survive. Doesn't matter if the poison is what actually kills the victim or if he dies of the stabbing but I don't want there to be very much blood as this is one of the hints for the MC that it wasn't the "duel to the death" that it's supposed to look like.
My setting is 1400s England, specially Yorkshire. My idea is that the murderer will nick what he needs from the Yorkminster herbalist, as he's part of Edward IV's household and therefore resident in the minster buildings for a day or two. It's May, if that has any bearing.
hope someone can help - googled "poisons" and "medicines" and "plants" and "herbal" in various combinations but there's so much individual detail that it's hard to filter it so I was wondierng if someone alreadyt has the knowledge I need!