Custom Combination Discipline / Technique

Lasombra have seen spirits, abyssal creatures, and other entities infect, inhabit, and possess objects, mortals, and vampires alike. The echoes of these creatures plague those around them all too often. Being no stranger to these dark entities, they have found ways to protect others from such things. Abyssal Exorcism allows the user to 'touch the spirit' to stir an entity or taint infecting or possessing the target and then use the Arms of the Abyss to wrench it out, removing the entity or its taint.

System: Summon Arms of the Abyss and establish physical contact. Make a Physical challenge, retest an appropriate Lore, vs the traits of the entity (e.g. Mental Traits, Pathos or Willpower per ST). Willpower can be spent as an appropriate defensive retest.
A successful test shows the Arms of the Abyss grappling and removing the entity or taint from the target, which could potentially be quite violent, supernatural, and is likely a breach. 
Unless the user wishes the entity to go free, the entity is returned to the Abyss with the Arms of the Abyss. Fully sentient entities can only be lost to the Abyss with ST permission. Entities allowed to leave generally return immediately to their appropriate plane or source.
Note that while ejection is the immediate goal, this power allows for the removal of related flaws or effects, such as Animate Shadow, Uncontrollable Night Sight, etc.
If the activation test is failed, make a static Willpower challenge (difficulty 6). Failure means that the entity or residue will instead move to the user (if possible).

The recipient of the flaw removal would be unable to regain Willpower per week equal to xp cost, i.e. a 2pt flaw would be 4 xp and 4 weeks unable to regain Willpower.