Ni is the absorptive function. Openness to experience related to being easily hypnotized. The narcissist is a tool. He absorbs everything others say feel whatever and reflects it back at them (for example ******, Ni+Fe). He technically gets brainwahsed briefly. By Si which is a more stable continuous form of being brainwashed. The narc is an intuitive who was forced to adapt to everyone else and then drop it, which is related to the zen state people enter when practicing something for a long time, a Ni can do it immediately as if he had practiced it and then drop it. It's actually those who you call the brainwashed who give the lead. The narc follows the lead and communicates it to them as he see is as one big whole which they perceive as spread apart. He fills the holes in their variety of delusions to unify them despite the inconsistencies (Fi/Ti + Ne is what takes care of inconsistencies). The narc is just telling others what they are thinking and want to hear. They are not afraid of admiting to life in a lie. They know they are lying to themselves. They are incapable of grasping truth. They do everything to stay as far away from truth as possible. They don't want to see how they exploit you because that will make them feel bad, and it's all about feeling clam and good, repressing the experience of pain (Si), superior and capable (Ni) or opportunistic/chaotic so you don't give a shit about what everyone does because you can deal with any situation, at the cost of being a hypocrite and unable to form attachments (Ne), or just focusing on the immediate moment without considering the broader picture (Se).
Ti and Fi (as Jung defined them) deal with right and wrong - truth. Too bad a lot of INxPs lie to themselves to achieve comfort or accept what's wrong with the world instead of trying to change it. They are stuck in what they know. N + T + F to become better by facing the unknown through manifestation, errode your stagnated psyche (S) to rebuild it into a better one. If you can utilize all cogntitive abilities you transcend your type. That's also the descent to hell in the stories or shamanic journey. Period of instability and suffering to come back with something new and better.