The Abandoned Luna's Return
a voice boomed.
From the center of the room, a massive figure stepped out. It was ten feet tall, made of matte-black armor and white light. It had the shape of a man, but its face was a blank, silver screen.
"I am the Sentinel Prime," the machine said. "I am the sum of all the failures. I am the wall that you cannot climb."
The machine raised a hand, and a blade of pure energy ignited from its wrist. It didn't lunge. it teleported.