Whatever the root cause of their behavior, a narcissist will cause untold suffering to those they abuse. They are spirit crushers; they take an individual and control, confuse, and torment them with a bewildering array of verbal and physical weaponry just to gratify their insatiable, egotistical mind.
Upon escaping this toxic personality, it can take a survivor a great deal of time to recapture some semblance of their former identity, but they will never quite resemble the person they were before.
Despite this, they will eventually reach a place where they are able to look back on their experiences at the hands of a narcissist with some small amount of acceptance. They will never fully understand why they had to endure such suffering, but they will no longer be imprisoned by the lingering influence of their narcissist.