Please offer some advice.

People. Yesterday, Arandor brought up the topic of the "Ring of Lesser Negation" (I took the name from Hugo). Today, I spent about 1.5-2 hours fiddling with it, like a monkey with glasses. I tried it here, then there, passed it to someone else, but in the end, I didn't notice any difference.
Does anyone know how to use it and what it does?:confused: :confused: :confused:
P.S. If possible, please test the answers in practice.