"A true master of shadows has white marking on his body."
"Shadow assassin Kayn is like a limitless version of himself—a true master of shadow magic. This manifests on his body in the form of white markings, which, in Zed’s Order of the Shadow, indicate one’s control over the shadows. Base Kayn only has a few markings on his hands and forearms, but shadow assassin Kayn is nearly covered in them. His free-flowing hair also reflects the unrestrained power he now possesses, with shadows emanating from the luscious locks."
Well, lore shattered around all places strikes again. It is only me, but the information is kinda really random and really... unfitting? White marks for a shadow assassine?
Nidalee has white marks all over her body 0: