Why?

The door to his cell opened, but he didn't look up.
"I have food for you." The auburn haired woman said.
"They're giving me a last meal then?" The boy replied flatly. "I guess it's the least they could do before they kill me."
"They aren't going to kill you."
He scoffed. "Right. They're just asked me all those questions and left me in a cell all night so they could let me go."
"I didn't say they were letting you go." The woman corrected him, placing the tray on the bed next to him and crossing her arms.
"Then what are they doing?"
"They are banishing you."
"What?!" His head shot up. "They're banishing me? From where?"
"This world." The woman turned and started for the door.
"Lady Artemis, I don't understand-"
"You will soon." She stopped in the doorway and turned to face him. "Good luck Perseus."
The door slammed shut and locked, leaving a very confused Percy Jackson to wonder about what his fate would be.