When Luke had descended into the River Styx, he would've had to focus on something important that would hold him to his mortal life. Otherwise he would've dissolved. I had seen Annabeth, and I had a feeling he had too. He had pictured that scene Hestia showed meโof himself in the good old days with Thalia and Annabeth, when he promised they would be a family. Hurting Annabeth in battle had shocked him into remembering that promise. It had allowed his mortal conscience to take over again, and defeat Kronos. His weak spotโhis Achilles heelโhad saved us all
Rick RiordanPeople usually asked her if she had a belly button. Of course she had a belly button. She couldn't explain how. She didn't really want to know.
Rick Riordan