Custom Blood Magic: Ritual

Advanced Ritual
Building upon Displacement of the Pneuma, the thaumaturge has developed a way to permanently bind a victim's body and soul, to serve as a punishment for the most egregious of sins. Not into an animal, but into a specially forged machine that will serve as it's prison for the remainder of it's miserable existence. Flensing of the Soul forces the victim to be bound forever, animating it's prison with it's very essence, and obeying the whims of it's maker.
The victim must be present for the creation of whatever will become their torment. The thaumaturge must construct the machine in question, and it must be made predominantly of metal. The machine must also be physically functional, though as an agony-powered creation it need not be practical or realistic. Though it cannot be more advanced than a combustion engine, as anything requiring a computer is simply too complex for a tormented spirit to focus on and control.
The casting of this ritual can take several nights, depending on the complexity of the vessel. The victim must be present for the entire time, but need not be mobile or willing. As much of their blood drained, and bones removed and reduced to powder, as can reasonably be done whilst keeping them still 'alive'. These elements will then be mixed into the forging process, sympathetically tying the created vessel to their very existence.
When the creation is finished, the remains of the victim's still living body are interred into the machine permanently. In that moment, they cease to be their former creature type, for all intents and purposes they have met Final Death. Their consciousness is bound forever into their corpse and the receiving vessel, to serve as a source of endless power if a machine. Yet every moment is now excruciating torture, the sensation of having their body pulverized and melted, beaten into malformed shape and snapped cruelly over cold metal, now the only feelings they shall ever know. They are bound to serve their maker against their will for the rest of their miserable existence.
When it is finished, the machine will be a self-powered and fully functional creation. Perhaps a small vehicle of some sort, a crude automaton, or a rudimentary but large mechanical tool. These tortured engines are still somewhat sentient - far too gone for higher intelligence, but they will follow their creator's commands and are capable of understanding even complex instructions. Such constructs have no need fuel or energy source, but cannot self-repair if they are damaged. Should the construct be destroyed, the being interred within it is destroyed as well. There is no means to extract the former victim from this fate, to restore or change them in any way, their only hope is total physical destruction.
System: In addition to the normal ritual test for casting, and whatever Crafts test are required create the vessel, the thaumaturge must make an additional ritual challenge for every Willpower and Health Level the target has remaining over the course of creation. Each success strips away one point of Willpower or Health from the victim, which cannot be replenished while the ritual is ongoing. When they have none remaining, the process is complete and they have been interred and bound into the vessel. At this point the character has been destroyed utterly, and only an obedient machine housing an eternally tormented shell of a former being remains.