Fake Gretchin

The petite but fearless Callidus Assassin Militzia Svarvelli infiltrates Big Mek Oilguzla’s workshops in the guise of a gretchin slave-creature.
…She hacks the Big Mek into fist-sized chunks before overloading his force-field generation and bringing the stomping advance of the Deff Dread mobs to a grinding halt.

"Dataslate: Officio Assassinorum"