Percy Jackson just wanted to live a normal life. After the giant war, the 7 heroes of the prophecy and 2 key heroes (Nico & Reyna) each got a gift from the Olympians. Jason was made into the minor god of wind currents. Piper was made into the minor goddess of charmspeak. Frank was made into the minor god of shape-shifting. Hazel was made into the minor goddess of gems. Leo was still believed to be dead from killing Gaea. Annabeth was made into the minor goddess of architecture. Nico and Reyna didn't know what to do with their wish. But we all know that our sweet, lovable Seaweed Brain wouldn't accept! He made the Olympians swear to grant his wish, he just didn't know what the horrible outcomes would be.