Shrike

He stretched out his arms, and an iron claw was ripped away, and another. Then he reached
Maggs and she made a choking sound and went backwards into the bracken and down. Ames flung down his gun and turned to run, but Shrike was suddenly behind him and he stopped short, gawping at a handful of red spikes that sprouted from his chest.

Mungo’s gun was empty. He threw it aside and pulled his sword out, but before he could swing
it Shrike had grabbed him by the hair and wrenched his head back and severed his neck with one scything blow.

Shrike, Chapter 22, Mortal Engines

With a hard clang, sharp, steel-blue blades extended from the Stalker's hands. It began to thrash its arms about. Its mouth opened and a terrible, deep, wordless cry came from it. One of the mechanics ran to a red locker on the wall and took out a clumsy-looking gun with a thick copper disc in place of a muzzle. He trained the weapon on the new Stalker's head and looked up at Wavey, waiting for her order.

Fever Crumb, Chapter 32