For a horrible moment, Piper couldn’t find her voice. Gaea seemed to be whispering to her: You must choose one. Why not let Jason kill him?
“No!” she screamed. “Jason, stop!”
He froze, his sword six inches from Percy’s face.
Jason turned, the gold light in his eyes flickering uncertainly. “I cannot stop. One must die.”
Something about that voice…it wasn’t Gaea. It wasn’t Jason. Whoever it was spoke haltingly, as if English was its second language.
“Who are you?” Piper demanded.
Jason’s mouth twisted in a gruesome smile. “We are the eidolons. We will live again.”

The Mark of Athena, Chapter XI