It was the betrayal of his sister that cost them their city. The respect of the high class, the unity that they had gotten not through the subjection of others but through alliances. She, in her mistrust, ruined it all for them and still Elijah sought to protect her. Klaus didn’t know why it hurt so badly. Knowing Elijah stood before him because of their sister. Perhaps it was because Elijah would do anything to protect her. Maybe it was because Elijah had never done that for him, not when he was human and when it counted, but then again - Elijah was with him because of guilt when he truly wanted his brother to stand with him out of love. “If you think to talk me out of it, save me your idle words. It will change nothing. I will kill her, and her lover, and anyone who gets in my way.”