Brush is the tall grassy terrain on a map that provides a champion (or minion/monster) a form of stealth. Upon entering the brush, the unit immediately turns invisible to enemies outside of that particular patch of brush. The unit will remain invisible until it has either left the brush or was scouted by an ability, item or an enemy unit.
This stealth does not make your champion invisible, but hides you from units outside of that brush. You will not be revealed by stealth detections that are not placed in the brush.
Since it's unlikely we'll have Fog of War due to increased server load, how about some use for the stealth stat?
