Drowned

Percy was lied to. He was betrayed. And now he can't ever go back.
Ever since the end of the Giant War, Percy had been battling PTSD and depression. Not that his friends, gods forsake his girlfriend, knows. He deals with the hallucinations quite well, and lately they'd even been fading more and more. But it seems that that was a hallucination of it's own. On October 16th Percy wakes up to Camp Half-Blood halfway drowned and bodies of campers floating in the water. It's his worst nightmare come true. His friends blame him, cast
him off. They say he's betrayed the camp in the worst possible way and he's just as bad, or worse, than Kronos and Gaia combined. So Percy leaves. Forever. And he'll never come back.