Player versus Environment
Player versus Environment (PvE) is a type of gameplay where players interact with computer-controlled opponents. Its counterpart is PvP, where the interaction is with other live players.
PvE in Guild Wars advances characters through a fixed story line, containing many different (and optional) quests and missions that are given by NPCs. Players are also immersed into the general environment and landscape of the game, as well as the lore pertaining to certain creatures, locations, NPCs and events.
 Missions and quests
In Guild Wars, the story is advanced primarily through a series of missions and quests to a pre-determined end. Completing these also progresses one geographically, opening up new areas of the campaign.
Each campaign (Prophecies, Factions, and Nightfall) has a separate, self-contained storyline, though players with multiple campaigns may play all three with a single character. The expansion pack, Eye of the North, also has a self-contained storyline available to players starting in any one of the campaigns.
Some quests are required to advance the storyline, but secondary quests are entirely optional and may tell side stories, give special items, or add that special depth to the in-game world. Certain quests can also be completed multiple times, and are considered repeatable.
 Other goals and rewards
Although the main purpose of PvE is to unfold the story and reach its conclusion, many people enjoy collecting titles, elite armor, dye to customize armor and weapons, and high-quality rare or unique items. Players who own the Eye of the North expansion may also set up displays in the Hall of Monuments.
Unlocking weapon and armor upgrades, skills, and heroes can be done in the normal course of PvE. Some players attempt to do so as completely as possible for both PvE and PvP benefits. For instance, heroes have access to all skills (including elite skills) unlocked on an account, which is useful for PvE play.
 Endgame content
Hard mode, with more challenging missions and new goals, becomes available for each campaign once you complete it.
 Relationship to PvP
- PvE characters may participate in PvP at any time, and there are several low-level arenas that are available only to PvE characters.
- All skills (except PvE-only skills from titles and missions) and heroes unlocked in PvE are available to PvP characters.
- PvP equipment for both characters and heroes may be upgraded with any component unlocked on the account.