(This is all speculation). We were led to believe that Kralkatorrik feared a world without him. During the end of LS4 he stated that he didn't fear death or a world without him. I'm just wondering why did he try to stop the supposed prophecy/vision he had if he didn't fear the outcome of his vision. Is it possible Kralkatorrik was trying to stop something We don't know about? We know he had a mother, which potentially introduces the possibility of a higher power beyond dragons and gods. Is it his mother he was trying to stop? Was Kralk consuming the mists out of hunger (most likely) or was it possible he was trying to seal entrances and exits into Tyria. Also why did Kralk want to kill Aurene if he wan't afraid of her replacing him in his prophecy, was it instead something Aurene might unleash or do in the future. I mainly want to hear other people's thoughts on why Kralk did what he did.