Shrike

Grike could not explain. He was a prisoner in his own body, with no power to control its sudden, deliberate movements. His arms raised themselves, his hands flexed. Out from his finger ends sprang shining blades, longer and heavier than his old claws. Like a passenger in a runaway tank, he watched himself charge at the other Stalker.

> [...]

Breaking free, he drove the blades of his right hand through Fang's chest in a spray of sparks and lubricants. The new claws were good, harder than Stalker skin. Fang hissed again, her gray robes in tatters, her armor ripped open and running with thick rivulets of the stuff that served her for blood. Oenone Zero was behind her, shouting, "You can't harm him! I built him to kill you, and I gave him the weapons to do it! Reinforced armor! Tungsten-alloy claws! Strength you can only dream of!"

Infernal Devices, Chapter 31, The moment of the Rose