Gods and Demi-gods read the Forgotten: sea's abyss

The gods made a huge mistake in their lives: forcing Perseus Jackson into Tartarus. Only moments after, the Demi-gods are pulled back in time to before Perseus arrives at camp to read about what will happen once Perseus escapes Tartarus. It will be the gods only chance to stop their destruction. But little do they know that their destroyer is there, with them, plotting their end.