Gray Rocking has been mentioned here lots of times. I have used this on my 87 year old mother who is a class A Alpha++ narcissists. I did some searching and found this video on You Tube. If you watch it I think you will get a better understanding. The series he does is also very good.
(Yes I am a nerd, witty or crazy depending on your view)
Tribe, I had heard of 'light grey rock' but your "medium chill" is much better! Yes, installing to my memory now for future practice.