Wendigo

“She’d felt more pain from Nico in their brief connection than she had from her entire legion during the battle against the giant Polybotes.”
― Rick Riordan, The Blood of Olympus

“He carried so much sadness and loneliness, so much heartache. Yet he put his mission first. He persevered. Reyna respected that. She understood that. She'd never been a touchy-feely person, but she had the strangest desire to drape her cloak over Nico's shoulders and tuck him in. She mentally chided herself. He was a comrade, not her little brother. He wouldn't appreciate the gesture.”
― Rick Riordan, The Blood of Olympus

“You will suffer, son of Hades!’
What else is new? Nico thought.”
― Rick Riordan, The Blood of Olympus

“Hades allowed himself the faintest smile, but there was nothing cruel in his eyes.
‘I can entertain the possibility that you acted for multiple reasons. My point is this: you and I rose to the aid of Olympus because you convinced me to let go of my anger. I would encourage you to do likewise. My children are so rarely happy. I … I would like to see you be an exception.’
Nico stared at his father. He didn’t know what to do with that statement. He could accept many unreal things – hordes of ghosts, magical labyrinths, travel through shadows, chapels made of bones. But tender words from the Lord of the Underworld?
No. That made no sense.”
― Rick Riordan, The Blood of Olympus