Time travel: some Titanspawn can time-shift and are trying to change the past so that Titans come out on top. The gods themselves are incapable of time-traveling for (mumble mumble) reasons, so they have to use Scions to prevent and/or correct changes to the timeline.

Inevitably, some gods (hello, Loki!) are also using time travel for their own purposes. This means that the Scions might travel to a version of history where one god or one pantheon managed to dominate or even wipe out the others. So when your Deva Scion ends up on a version of Earth where only the Deva exist, that’s...