Sacrifice, Life, War

At the Doors of Death Percy and Annabeth make a selfless decision. THEY choose to sacrifice themselves and send Bob and Damasen's to the surface. With instructions to help the Gods. Percy and Annabeth end up facing Tartarus. Everyone believes them dead. Now 300 years later war with Tartarus, Nyx and more comes. And with it allies from Chaos come. With surprising members…