I feel like this is a new hidden weapon in my arsenal. (viktoriastable.com)
Points are earned by completing missions, finding hidden weapons and collectibles, or by racking up some serious combo scores. (gamersinbeta.com)
They'll reveal the locations of hidden weapons and tag nearby enemies for you, then you can choke them unconscious or execute them with your knife — but make sure you hide the body. (pcgamer.com)