Bonesaw- Acid Inject

One of Bonesaw’s mechanical contraptions leaped across the room, its scalpel legs impaling the suede cushions on either side of Mark.  One leg, tipped with a syringe, thrust into Mark’s right nostril.  He hollered incoherently, tried to pull away, only for two mechanical legs to clutch his head and hold him firm.

Amy’s screams joined his.

“I’m doing you a favor, really!”  Bonesaw raised her voice to be heard over the screams.  “You’ll thank me!”

Amy rushed forward, hauled on the metal leg to pull it from Mark’s nostril, pulled at the other legs to tear it from him and then hurled it away.  Lighter than it looked.

“Now fix him or he’ll probably die or be a vegetable,” Bonesaw told her.  “Unless you decide you’re okay with that, in which case we’re making progress.”
...

Now she had to focus on his brain.  The needle had drawn ragged cuts through the arachnid layer, had injected droplets of acid into the frontal lobes.  More damage, in addition to what Leviathan had inflicted with the head wound, and it was swiftly spreading.

- Worm, Interlude 11.h