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[anagogy]

Let's say you are in a place where you feel there are many thoughts forms of elitism, duplicity, manipulation, greed...
And you must interact with narcissists, STS people and you feel the unpleasant effect on your energy field and body.
Is there a way to protect your aura by creating an energetic field ?

I would spend as much time as I could re-imagining them as friendly, helpful, service to others oriented individuals. Will this change who they are at their core? No. They choose that. But their reality can only interface with yours to the extent that the vibrational hooks or landing pads are there, in you, for them to lock on to. In other-words, either the more positive characteristics in them will rise out to meet you, or they will vibrate right on out of your experience (not instantaneously of course, this is slow as molasses physical reality. It's going to be gradual).

Visualizing an energy field that protects you from these effects could also work, but in my opinion it is less effective, and is mentally draining because it activates two contradictory vibrations: the vibration of "all these STS buggers who are trying to drain me" and the vibration of "this energy shield that is protecting me from said absorption". So you sort of get a "push/pull" dynamic of energy going on.

If you can truly see these, or anybody, in another light you get at the root of the vibrational activation bringing the negativity into your experience. And as I'm often fond of saying, all of this is always easier said than done, no matter which course of action you take.

Good luck.