Prophecy has been spoken. The gods saw an event coming and hoped they knew a way to deal with it. But they did not foresee people.
People have a little thing called free will.
A great evil was unleashed. A cult did dark terrible things to produce a child who walked both in the living world and the world beyond. This child has been a trophy among occultists for thirty years, but it is a cursed folly. No one who held the child lasted long as from one side of the door evil looked for a way into the world of flesh and from the other side zealots seek the door for their own imagined uses. The child Dor/Dorit is a supernatural hot potato that destroys whoever holds onto it too long.
Until Conner stepped in. The gods had assigned Conner the task, a fact if he knew he'd not find amusing. Dark forces used one of the cult's other experiments, a school group called Playtime, to lure him there. Now that he's met the child, his inner compulsion draws him to the right ethical choice.
The gods have set Belinda to clean the door, though she has a long journey and a lot of difficult trials to face before she can. If she is successful, the very fate of the world hangs on her choices.
These were propagandized by the ordered gods of light and dark a thousand years ago.
The gods of chaos, however, quickly threw a monkey wrench into the mix by ensuring that Conner's sister Eliza would follow. Her presence throws everything off, and now the Prophecy is no longer valid. In addition, they've crossed paths with a small research group looking for the lost city of Atlantis whose presence further shifts the path of the future.
The pieces of the board have been set. Free will has shattered expectation. Not it is up to the various choices of those involved to decide the inevitable outcome.