Silver Steak
The Ghost of SS
Seth Dethos essentially knows everything there is to know about Death magic. Or, at least, he knows all the spells that were made in Wu'di's heyday. As for Shezmon, he is just another Death Adept, and has only memorized a few select Death magic spells. If for some reason you assumed he had access to the entire branch like Sethy does, I will not allow that under any sircumstances. The thing is, there is a limit to how much one man can have inside his brain.