Karma is an universal law, where everything, good or bad, eventually evens itself out. A balance beam, a spy, a justification process and it has its eye on you. It will strike at a moments notice, when you least expect it, to moderate neutrality.
One of the actions that it looks out for, is human arrogance such as narcissism. Know that there are particular identifying markers, when it comes to recognizing the pathological narcissists among us.
There are clinical definitions, this based on case studies of this personality disorder.