Wendigo

“Please!’
That word didn’t make sense to Nico. The Underworld had no mercy. It only had justice.
‘You’re already dead,’ Nico said. ‘You’re a ghost with no tongue, no memory. You won’t be sharing any secrets.”
― 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

“Legion, cuneum formate!’ Reyna yelled. ‘Advance!’ Another cheer on Jason’s right as Percy and Annabeth reunited with the forces of Camp Half-Blood.

‘Greeks!’ Percy yelled. ‘Let’s, um, fight stuff!’ They yelled like banshees and charged.

Jason grinned. He loved the Greeks. They had no organization whatsoever, but they made up for it with enthusiasm.”
― Rick Riordan, The Blood of Olympus

“My son, what you are attempting – shadow-travel across the world, carrying the statue of Athena – it may well destroy you.’
‘Thanks for the encouragement.”
― Rick Riordan, The Blood of Olympus