Custom Blood Magic: Ritual

Materials Required: Appropriate trait of Kindred vitae, target’s True Name
Discipline Prerequisites: Hermetic Thaumaturgy
Fluff: Mistakes happen, deals are broken, something needs to change.
For whatever reason, sometimes someone learns something they should not have. An infiltrator to the Sabbat learns Vicissitude to escape Final Death; someone accidently learns Obtenebration without getting on the registry. Someone gets something because of being in a faction, and now they are not. And rather than kill the target of this ritual, the problem can be corrected. Death is referred to in Kindred circles as Final for a reason.
The target of the ritual has a restricted discipline (for whatever reason, and of whatever sort). Using their True Name to forge a link, and a trait of blood from a vampire with the restricted discipline in clan, the thaumaturge can remove the discipline in question.
System:
Take their True Name, and a trait of the blood of a vampire that has the discipline to be removed in-clan. As this ritual has no capability to affect the target’s in-clans, obviously the target’s blood may not be used on the target. The trait works like a filter, getting rid of the discipline specified at the time of the casting.
This ritual requires an unresisting target (willing or in torpor). The targeted discipline is "removed" for a number of weeks equal to the number of temporary traits of the appropriate category spent at the time of casting. Vicissitude and Obtenebration would be physical, Obeah would be mental, Chimerstry would be social. Trait type based on the type of challenge used for the power. Cannot do anything to native blood magic, or the target's in-clans. Native blood magic is defined as blood magic inherent to the blood of the target: Hermetic Thaum for Tremere, Dur’an’ki for Assamites, Necromancy for Giovanni and Samedi.
The removal is temporary as per above. After the removal, the character if subjected to tests that would determine the presence of that discipline will report a negative result; however, any secondary consequences (such as infernal taint generated by the presence of Dark Thaumaturgy, for example, are still detectable, and not hidable during the removal/suppression time. Any combination disciplines that require the removed Discipline as a pre-requisite may not be used, but are not lost.
Due to the changes to the target's very Pattern/Soul, only one Discipline may be affected per actual calendar year; no Discipline, Gift, Sphere, Arcanoi, Art, ritual or magics of any sort can accelerate the passage of time to reduce that.  Likewise, the target cannot re-learn the same Discipline during the same year, as their Pattern will refuse to accept the alterations.