The Chalice of the Gods Novel by Rick Riordan

After saving the world multiple times, Percy Jackson is hoping to have a normal senior year. But when he and his friends are attacked by a mysterious enemy, they are forced to embark on a dangerous quest to find the Chalice of the Gods. The Chalice is said to be the source of all power in the universe, and if it falls into the wrong hands, it could be used to destroy the world.

Percy and his friends must travel to the Underworld, the land of the dead, to find the Chalice. Along the way, they will face many challenges, including mythical creatures, angry gods, and treacherous allies. But Percy is determined to save the world once again, even if it means sacrificing everything he holds dear.