“I’m not done,” said Gideon’s half-dead necromancer.
Harrow closed her hands. The last thing Gideon saw was the debris of her perpetual servants rattling toward them, bouncing through the air and over the flagstones, hardening in a shell over her and Camilla and Harrow as all those tendrils struck them at once. The noise was deafening: WHAM—WHAM—WHAMWHAMWHAMWHAMWHAMWHAMWHAM—until it became a single hammer, a metered pounding: WHAM … WHAM … WHAM …
The world vibrated around them. Everything was suddenly very dark. A wavering yellow light flicked on, and Gideon realised that against all odds Camilla had somehow retained her pocket torch.
They were closed in with the bowing iron trellises and the wilting, anciently dead bushes. The sky, the sea, and the rest of the garden were cut off behind a smooth curved shell of what seemed to be solid, uninterrupted bone, like the hemisphere of a propped-up skull. Harrow swayed upright in the gloom as the beast tried to crack them open like a nut and looked at Camilla and Gideon through a face that was mostly blood. Not even blood sweat: just blood. Beneath her skin blood vessels had detonated like mines. It was coming through her pores. She’d figured out how to make perpetual bone, half-destroyed a giant dead spider from hell, and now she’d raised a solid wall six inches thick and was holding it up with sheer nerve.
The Reverend Daughter of the Ninth House smiled, tiny and triumphant. Then she keeled into Gideon’s arms.

Gideon the Ninth - Act Four, Chapter Thirty-Six