Dominance is a paper note in Fallout 76, introduced in the Expeditions: The Pitt update.
Location[]
The note can be found in the sewer section of the Sanctum, inside of the torture room with the hanging chains, during From Ashes to Fire. The note is on a desk with some chalk drawings on ti.
Transcript[]
Remember, assert your dominance. They scream at you, you scream back, louder.
If that doesn't work give 'em a solid crack to the skull. That'll send 'em crawling back into their holes.
Works every time on the little bastards. It's the big bastards you need to watch out for.
You see one of those and you'd better find a turret to hide behind real quick.