Zeus and Apollo must work together to defeat this new enemy who literally has this giant gateway that kills anything that enters, including Immortals.
It turns out that there are two oaths that come in. Zeus promised to be a better leader and Apollo promises to rule over Zeus. Both are fulfilled by zues stepping down to gain Apollo's alliance.
The half-bloods shall need to assist the gods and will probably literally answer a call. Percy, of course, will be one of them. So will his friends.
The world will fall down to the will of Apolo and his sun chariot (fire)
ASaAppolo and zues bear arms as foes and well… I also plan for some half-blood rivalry. They will end up fighting death in a big showdown then have an epic party and everything will be resolved.
