Before anyone jumps at the chance to say I'm the one who

File: superman-doomsday-color-113226.jpg (1MB, 1500x1017px) Image search: [Google]

1MB, 1500x1017px

Before anyone jumps at the chance to say I'm the one who wants to do it, please forget it.

I've been writing a book with super hero elements and in the climax one of the characters will attempt to kill the main hero (something like superman). I had originally written this ending to be done with a gun designed by the main character, but I feel this will no longer work out how I envisioned, so I need a new method and I'm going with poison. Problem is I don't have any details on how to make poisons, and I'm trying to figure out the steps to make something like ricin, or something of a similar potency. I know most peoples first reaction when people ask questions like this but I don't have a death wish. The character in the story who makes it is a sort of mad scientist so he will have access to most science equipment.

tl;dr
Step by step guide for a mad scientist to make ricin or similarly powerful poison to kill a superhero.