When Jason heads into Tartarus, he can pick just two companions to journey with him. Achilles' response if he's not chosen? "I wish I was going with you, Jason. But you know what you're doing. You'll be fine."
Atalanta reconciling with the spirits of her deceased parents as they pass into the afterlife.
Jason's enduring and never-ending love for Alceme proves to be a heartwarming factor that is present throughout the story and grants him the resolve to succeed in his quest.