Player combat in WoW is governed by a system in which one must be “flagged” for PvP in order to attack or be attacked by other players. Servers in WoW, called realms, are labeled as either “Normal” (also called player versus environment, abbreviated PvE) or PvP. On a PvE server, a player is only flagged for PvP by either manually enabling it or entering specific areas such as enemy capital cities and battlegrounds. PvP effectively must be consensual to occur. Meanwhile, PvP servers flag all players for PvP combat unless they are in specific areas designed for low-level characters. Attacking a player or NPC from the opposing faction will result in automatic PvP flagging on either type of server. A notable exception to flagging rules is the “sanctuary” of Shattrath City, where no PvP combat can occur.