Baali, Infernalists
Dark Thaumaturgy is simply Thaumaturgical knowledge gathered from demons, rather than a separate discipline. Learning a path or ritual from a text or another vampire does not leave the taint of the Infernal on a vampire. Trucking with demons, however, stains the soul in a serious way.

Dark Thaumaturgy has levels and paths, just like Thaumaturgy. However, Dark Thaumaturgy comes with a price. Traffic with the Devil's minions permanently scars the soul, and the taint of infernalism manifests in the Dark Thaumaturge's aura. Before long, the unmistakable marks of the Devil's favor may even appear physically, as a wart on the nose, a "witch's claw" behind the ear or even (among the most Damned of the Damned) withered limbs, freakish scars, horns or cloven hoofs.

Investments are abilities awarded by demons to the those who serve or enter a pact with a demon. When one enters into a pact with a demon, the demon will give investments, wealth, personal service, objects of desire, and more. The power of an investments is with the demon not the receiver of the investment. A vampire with even one investment will have a devil's mark called a witch's nipple.

Demons cannot be blood bonded nor can one be bonded to a demon. To drink from a demon's blood provides no nourishment to a vampire and will either give an extremely pleasure rush or make one very sick. If a vampire repeatedly shares blood with a demon, one of the devil's marks will appear on her. Pact
Minor 1 Investment Point
Average 2-3 Investment Points
Important 4-6 Investment Points
Important and Dangerous 7-8 Investments Points
Give soul freely 9-10 Investment Points

The soul of not the first thing an infernalist will give away. Pacts of nine pts or less can be made as many times as the infernalist can get away with.