The Omega's Return

Years after a betrayal that shattered him, Percy Jackson is exiled and presumed lost. But he re-emerges under the alias Omega, a powerful, mysterious trainer summoned by the gods themselves to prepare the next generation of heroes. Cold and distant, Omega's identity is hidden, though whispers echo about his true origins. But when he pushes a young demigod named Daniel to new heights, doubts and suspicions simmer among the campers-and especially within Poseidon, who can't shake the feeling that Omega is closer to his heart than anyone realizes.
As old friends and former allies confront Omega, Annabeth steps forward, confessing painful truths about her role in Percy's downfall. Slowly, Omega's icy exterior softens, yet he never reveals himself, his loyalty to Chaos shrouding his past. When Daniel's battle prowess finally proves himself worthy, Omega congratulates him with a trademark smirk, hinting at his true identity before vanishing.
Years later, just as peace settles across the demigod world, an unexpected appearance at Daniel and Aisha's wedding causes an uproar. A tall, hooded figure stands in the back, smirking, and everyone hears his voice ring out: "Hey guys. Who missed me?"