End of Qos…?

Ok so I just got up to the part where The king dies and what is with the crap he said? If he said that he doesn't want to kill then then why did he put a collar on Dorian. And Dorian said he was lying. Was he right? I don't understand the stuff he said abt Erawan either. With the Duke. Can someone explain it to me 🙏 (Qos spoilers)