One of Percy's conflicts was fighting a Minotaur the Minotaur made his mother go to underworld also he had to fight a fury. Also pay money for gambling funds for his stepfather. "And she was about to slice me to ribbons" "He expected me to fund his gambling" "That night I had a vivid dream".
Percy is motivated to get his mother out of the underworld and safely comeback to earth. Water is also motivated by him so he can control water. " The toilets responded