He wanted to save Yeul from her fate as a seeress... to stop her from dying over and over. To do that... he wanted to stop time itself. [ Her frown, which has not disappeared at any point during this conversation, seems to grow more pronounced. ] I'm not sure I understand this entirely myself, but... Caius said he had Etro's heart inside him. He was made immortal by her.

[ Put like that, it's starting to click. ] When Noel refused to kill him, Caius forced him to. I think... when he died... that Etro must've died as well.

[ It's only as she speaks that she realises the gravity of what must've happened, of Caius' plan. She'd already accepted the sacrifice she'd have to make to change the future. But what had it amounted to? ]