Cress

“Blood trickled from the corner of her (Annabeth) mouth. She croaked, "Family, Luke. You promised."
Luke stared at the knife in Annabeth's hand, the blood on her face. "Promise." Then he gasped like he couldn't get air. "Annabeth . . ." But it wasn't the Titan's voice. It was Luke's. He stumbled forward like he couldn't control his own body. "You're bleeding. . . ." He gasped again."He's changing. Help. He's . . . he's almost ready. He won't need my body anymore. Please—"
"The knife, Percy," Annabeth muttered. Her breath was shallow. "Hero . . . cursed blade . . ."
Luke turned and collapsed, clutching his ruined hands."Please, Percy . . ."
Luke seemed to know what I was thinking. He moistened his lips. "You can't . . . can't do it yourself. He'll break my control. He'll defend himself. Only my hand. I know where. I can . . . can keep him controlled."
I raised the knife to strike. Then I looked at Annabeth, at Grover. And I finally understood what she'd been trying to tell me. You are not the hero, Rachel had said. It will affect what you do. The line from the great prophecy echoed in my head: A hero's soul, cursed blade shall reap. My whole world tipped upside down,and I gave the knife to Luke.I watched as Luke grasped the hilt he stabbed himself”
― Rick Riordan, The Last Olympian