A big trait of narcissism lies in having allies. You will not see a single narcissistic person doing everything alone, speaking up and standing alone. A narc will always have one or the other person to back them up or their stance or story, to gaslight the victim, because the more the witnesses, the more it looks real, though in reality it is all made up to save oneself from the shame of being exposed. The victim is usually tried to be broken mentally, considering his/her truth as the illusion because the victim generally does not have the proof to show to anyone, and anyway to whom will the victim try to prove anything when the narc has already isolated him/her from everyone to whom the victim can connect or tell the truth. By the time, the victim gets to know the truth, the narc already has many people on his/her side to witness how good he/she is (the ideal person anyone can ever know who has no human weakness). Planning in social dealing is the narc’s forte. Not many of his good actions will go unnoticed and bad ones noticed and all the bad deeds will be covered up by his allies. And just in case, a few of the innocent allies will get to know the truth, they cannot do anything about it because they have already got involved into something wrong and thus out of guilt cannot say anything about it.
Just in case, the narc is losing allies, he/she begins to triangulate the victim with somebody else. Here, the comparisons begin which the normal person does not prefer. (Triangulation is a different topic).