Percy Jackson: Betrayal

Two times savior of Olympus was betrayed. Heartbroken, he left camp but fates had something else in store for him. He was captured and brought to Olympus. Some gods stood on his side, but the majority didn't. He was BANISHED.

He becomes Chaos' right-hand man, commander of his army.
The new threat rises on earth so he is sent back with his companions to help with the war. On Earth, old secrets are finally uncovered. The new prophecy is told.
Will they save everybody,
Or be Olympus' downfall?