31 parts Complete The gods thought they could control him.
They were wrong.
Born of the Primordials Ouranos, Erebus, and Pontus, Percy Jackson is no longer the pawn of Olympus. He commands an elemental army, wields weapons forged of storm and sea, and rules a black fortress that even the gods cannot breach. He has already fought the Olympians and lived to tell the tale. But now, a greater enemy stirs.
The ancient seals forged after the Titan War are failing. Something older than gods, older than Titans, is pressing against the chains that bound it. When the first seal cracks, Percy must stand between his enemies and a force that seeks not conquest, but the end of all thrones.
As Olympians close in to destroy him and Titans whisper for his allegiance, Percy faces impossible choices. Can he hold the fortress against gods and monsters alike? Will his fragile truce with Thalia, Annabeth, and his army be enough when even Zeus fears the enemy beneath the earth?
And when the voice in the dark begins calling to him, offering freedom from chains and vengeance against Olympus, Percy must decide: is he the storm that will save the world - or the one that will end it?
The war of gods is over.
The war of everything else is about to begin.