In the world After Reset, Stalkers are represented by very small groups of people that are somehow connected to the Artifacts left by aliens during the Reset.
Before the Dallas Incident, there hadn't been much evidence regarding their existence - only rumors and stories among survivors who caught brief glimpses of them, or the strange Artifacts they seemed to revere and protect. Rumors suggest that the Artifacts are actually alive, that they could "talk" with certain special people, even "change" them in strange and often unpredictable ways. Others simply disappeared, though there are few who claim to have witnessed it. There are simply more questions than answers when it comes to the Stalkers.