Emerald eyes

After Percy received the new phrophecy.

The Sea alone, will follow the trail to the broken plains.
to free the snake wrapped in chains.
Together, defeating the shadow Drakon.
The Phoenix will yield to the silver magician.
Thunder will bow to the lightning retriever and reconcile the the long standing feud.
The four shall unite, to concour the Hunteress.
To ice, venom or thunder
The hunteress shall fall.
After eleven, one more shall be spoken.
But be warned son of the sea, you must beware the wolf."

He must journey north to find an unknown person.

But first he must help his father with something...