Guiltythree
So what I am gathering from at least Nightmare 2 & 3 is this. They cannot die except by the knife designated for them. Aidre died by Solvane using the specific knife she had. These two brothers are arguing over another two knives that he, Sunny gave one to Shadow and hid the other. And because of that he is torturing his brother to find the knife he hid but cannot die because of their specific attribute of living as an Immortal. Death by knife, only!!! Nicely done. Makes me wonder who the obsidian knife is for. Could that be the knife for Noctis?? We already know the wooden knife is for Solvane. And the brother Dearests, which two knives for them. The Ivory and ??