Board Thread:Off Topic/@comment-26397825-20151211051732/@comment-26397825-20160116021034

Why? It has limits; must be used in an enclosed space and the user can't be distracted or it fails, completely drains the users aura so they are extremely vulnerable to attack after doing it, and it breaks their will. Technically someone with a broken will can regain it, but the reason why they would be a slave to the user is because they wouldn't see any other option. Once they are offered another option, it'd be just like giving them hope. They'd have a new will to go after the other option and would therefore no longer be a slave to the user.

It's like torturing someone until they cave and do your bidding. They'll keep doing it out of fear of being tortured again, but as soon as someone comes along with a very good chance of succeeding and saving the victim from the torturer, they get hope and in most cases will no longer be a slave to the torturer.