An official ruling for this phenomenon can be found in the Storyteller’s guide to the Sabbat. Below, you find a fan-created re-write. The material below can be considered offending to some, especially those of religious background. Reader discretion is advised. Know yourself.
If one decides to deal with the devil, one looses his soul. Therefore, every (N-)PC begins his (un-)life with 10 soul points. Every level of demonic investment bought requires the selling of one soul point. As our soul defines who we are, it is impossible to have a Humanity or path of enlightenment rating higher then your Soul rating, since your soul defines your humanity. If you are tricked into selling your soul and find out that you have in fact sold your soul, you may make a conscience roll. If you succeed, you may show redemption (see below). If not, then not.
If your soul ever reaches the 0 rating, you have completely handed your soul over to Satan. If you reach this stage, there are two roads which you can follow:
A: Show Redemption.
Take a derangement to re-buy the first point of your path of enlightenment or Humanity. With the assistance of a spiritual man or woman, you may prey to whatever name you use for the Divine one and beg him for forgiveness. During one session, make a conscience roll (diff. of 10-True Faith rating of the helper). For every success, regain a soul point. You may now begin to re-buy your Humanity or path of enlightenment. As soon as you reach your complete soul again, you loose all your demonic investments. This is a long and painful process and should be role-played as such.
B: Deal for the Devil.
If you have no intention of bowing down for the Lord, you may just as well embrace the Devil. For this, you replace your current path of enlightenment with the path of Inner Winter (see below) and take a derangement (religion based is appropriate). You may now start to buy souls for Satan yourself. For every three soul points you accumulate for Satan, you get one point of Dark Soul. This Dark Soul replaces your normal Soul. At no point can your Dark soul exceed your path of Inner Winter rating, because this path defines your "devilishness". Buying dark soul points costs 2*current rating of soul points. The first point of Dark soul costs 3 soul points, like for any other path. You may also spend dark soul points as normal soul points and buy even more demonic investments.
Once you’ve chosen this latter road, you have become a demon in the making. You are now a member of the local demonic temple(introduced by the one who bought your final soul points from you), in which you will take the most bottom position. This is based on your Dark Soul rating. Those with the highest Dark Soul are higher in this hierarchy. As your Dark Soul rating grows, it will begin to show on you as well(The changes in appearance are not important, they are mearly a representation for the state the follower is in):
| Dark Soul rating | Symptom |
| 01 | Third nipple |
| 02 | Holy water does aggravated damage |
| 03 | Touch of a cross, held by an individual with True Faith does aggravated damage. Make a Willpower roll to advance towards one. |
| 04 | Your eyes turn yellow. |
| 05 | Extremely hairy lowerlegs. |
| 06 | Only raw meat and blood nourish. |
| 07 | Fingers and toes fuse to two fingers and a thumb |
| 08 | Your skin turns red. |
| 09 | A Sulfurous odor surrounds you. |
| 10 | Skin thinkens to resist fire more easily (diff. of fire soak rolls=-1, diff. of toutch sensitive actions=+2.) |
Finally, as one reaches Dark Soul 10 (and has thus reached path of Inner Winter 10), one is required to commit suicide (see hierarchy of sins). If this is done, then that individual will be reborn as a lesser demon. Usually, the sacrifice is a ritual affair, with all the temple’s followers present. As his body of the one who was to commit suicide falls to the ground the other members of the temple begin their celebration and a three days and nights long party commences. During this time, the body is not touched. Then, the new highest in rank of the temple takes the body to a back room were it will be eaten by the animals of the temple. Once the last piece of flesh has been removed from the skeleton (usually by maggots, but some templars are known to boil the skeleton as to hasten this process), the Dark Soul of this newly formed demon rises as a demon in hell and makes his way beck to earth (if he desires). The demon has complete memory of his previous life. As demons have their own powers, I don’t think that retaining Disciplines, Gifts, etc. are in order.
The path of Inner Winter:
Ethics:
Mortals are sacrificial sheep and should be treated as such. Personal gain is useless, except as a sales pitch. Representatives of the Divine are the best subjects of practical jokes. Show reverence to and obey those higher then you on the path of Inner Winter, for they are closer to Satan then you.
Corrupt, corrupt, corrupt!!
Common Traits:
Talents: Empathy, Subterfuge.
Skills: Etiquette, Performance, Melee, Haggling, Seduction.
Knowledges: Occult, Medicine, Demon Lore.
Common Followers:
Anyone (bwuhahahahah!!!)
Hierarchy of Sins:
10: Refuse to sacrifice yourself for Satan.
09: Refuse to sacrifice those close to you for Satan.
08: Refuse to take the souls of those close to you for Satan.
07: Refuse to torture and murder for Satan.
06: Aid anyone not on this path without personal gain (for Satan, of course).
05: Show sympathy for the weak.
04: Refuse to take someone’s soul for Satan.
03: Refuse to assist someone else on this path.
02: Refuse to corrupt, like bring someone into the grasp of Satan’s machinations.
01: Refuse to defile a holy place.