It's called the Bone Cage.

Each morning, the rusting iron box is filled with bodies. The Bonelords cart wagonloads of naked, limp manling flesh to the top of a steep incline. They operate levels and turn great wheels. Gears squeak and squeal, corroded and greased with blood. The half-starved, half-dead, half-crazed manlings are dropped in, sometimes by hand, sometimes by wicked hooks of the Bonelords' necrotic workers. The dead feeding the dead.

High above, the Shadow Witch stretches out on silks and satins. She is nude, save for some whisper-thin ribbons of dark blue. Her eyeless slaves are chained to the railing of her palanquin. They see the world through her eyes, and through the sting of knotted leather and the bittersweet taste of the witch-milk. She calls for more bodies, more blood. The Bonelords laugh and comply, ready to please their dark mistress. The Shadow Witch smiles.

The Bone Cage, the dying manlings, the Bonelords, the carries, the Witch, the slaves. High on side of the mountain. A basalt dome rising from smoking charnel pits. Carved in the side, the Palace of Pain and Pleasure. And looming above is the wreckage of the Gravestar, Carnifex. The doomed planet. The dead world, now joined to the earth, a serpent coiled around prey. Fangs driven in too deep to ever remove.

Silver eyes speed overhead. Twin contrails fan out from her engines. Wind-Sister cuts through the wisps of cloud, blazes down low and roars out her anger in the whirring, ripping, cycling of her gun chambers. Somewhere, down below, her mate lies in agony within the nightmare of the Bone Cage. His metal skin is torn and his circuits have fuzed, one by one, until the amber glow of his mind has faded to distant light.

"Metallic, I am coming for you!" Wind-Sister scans her targets and swoops across the side of the mountain. The necros lie in ruin, the Bonelords have scattered to the pits. Those that stand and fight are cut down by dual rivers of molten metal, arcing from sky to earth.

The others begin to climb up to the Cage. They will save him. Machine World will not lose its brightest star.