Playing as a Scav is like playing the game without rules, one where the players can experience quite different gameplay with a focus on reckless abandon. The Scav player is spawned together with AI Scavs - for example, in a locked spot on the map, in the middle of the time allocated for the raid. Scav tactics change up the overall style of raid gameplay, and in most cases, complicating the lives of BEAR and USEC players, while also fighting amongst themselves.
You can try the Scavs gameplay in the nearest patch!
