http://wiki.guildwars2.com/wiki/World_PvP
World vs World, WvW, World PvP or Casual PvP, is a mode of Player versus Player combat which takes place in the Mists. Worlds, or servers, are randomly matched up against two other worlds. Those match-ups will be rotated every week to match worlds against those of similar strength. The combat is open and features many objectives and roles which players can do; "players may decide to fight alone against a supply caravan, join a single group and capture a mine or create a large alliance to assault one of the numerous fortress that could give an advantage in the zone." The battle is on a large scale, where hundreds of people can fight on each side in week-long battles.
Each opposing world starts out with castles, mercenary camps, mines, lumber mills and villages. Separating the starting zones are neutral zones controlled by no one, also containing fortresses, mines, and villages.
The resources gained from mines and lumber mills are used to rebuild walls, create siege engines, and generally defend the team's fortress.
These territories and control points will confer benefits to the world that controls them; "maybe everyone gets increased energy regeneration or healing rate or enhanced loot drop rate." Players can gain experience and level their character in World PvP. Guilds will be able to take and hold keeps.[1]
Players are free to come and go from the battle as they please and there is no limit to the number of players entering. Players enter with a character of any level and use skills they have available to that character. Characters can enter as a sidekick which will allow them to play as a higher level character.
World PvP is intended as a casual form of PvP, designed to be a more relaxed bridging point between PvE and the tactics and pressure of structured PvP. It is hoped that players of any level or PvP experience can participate and be useful.
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