User blog comment:Darkcloud1111/Camp Half-Blood Series General Discussion/@comment-3146930-20130928014211/@comment-3146930-20130928022845

Ok, after the first Great Prophecy was announced, in order to try and control it he ordered Hades to bring Nico and Bianca to Camp Half-Blood so he could watch them. When Hades refused, Zeus tried to kill them. This lead to Hades cursing the Oracle, preventing her soul from leaving her body.

Eventually, May offered to try and become the new Oracle, but was driven insane because of the curse. Then as Luke grew up, he became scared of his mother's fits of insanity and that was what caused him to start to hate his father and the gods overall. This hatred allowed Kronos to ultimately take control of Luke, resulting the in second Olympian War.