"Now Annabeth...why did you fail at persuading the River Guardian?" Hades asked her.

"It's not my fault." Annabeth said. "Percy keeps getting in my way."

"I see..." Hades said. "Pain! Panic! What is the meaning of this?!"

"It's simple." Annabeth said. "They failed to kill him. Don't you see? He's invincible now."

"Not quite." Hades said. "He is still mortal. And I have plenty of monsters who would love to kill the son of Poseidon. And you, my priestess, are going to lead him right to the slaughter!"

"N-No..." Annabeth gasped.