"So, you can't stay?" Derek asks.
"I want to but my uncle needs my help in the Underworld," Amy says. "You know the entrance way. You can live there and still come up here. We can get married. But Hades needs my help with the Underworlders and training Judas."
"I'll miss you," Derek says. "When will you be back?"
"It'll be a long time but you'll see me everyday," Amy replies.
"You're right, I will," Derek replies and he kisses his fiancée.
Amy goes ams she sees Deucalion to say goodbye to him... for now. Deucalion understands why she's going. Her family needs her help and he can respect her helping Hades out with Judas and the Underworld. She goes to see Peter next and her family: Melissa and Scott. They both hug her and then Amy goes to put in for some much needed RNR time with Stilinski and he said he'll keep a spot open for her.
Amy then travels to the Underworld and Hades shows her to her and Derek's room in the castle.