Champion Of Olympus

Post 'Blood Of Olympus'. A new Prophecy foretelling the destruction of Olympus is foretold, Zeus forbids the demigods to know & closes Olympus. Meanwhile, a mysterious man with immense strength shows up at camp and the campers must figure out who he really is and if they can trust him. Who is he? Was he sent by someone to kill Percy or will he stand with the camp during the Prophecy?
(REALLY OC Centered)