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For the sections of boss encounters often referred to as "phases", see stage.

Phasing is a technique commonly used in MMORPGs. This refers to the technique of having a certain area look different to different characters.

How it Works

Data on the location of game objects, players, and NPCs is not stored in the World of Warcraft client and must be sent from the server. Phasing, in a sense, decides not to send certain data based on criteria.

As an example, you may have a quest to get the head of a named NPC. After turning in the quest, the server records that it should not send data about that NPC to you. The next time you go there, even if the NPC is still there, you will not be able to see it.

By using combinations of phasing, entire areas can change from grasslands to a city by use of game object phasing and NPC phasing.


NPC phasing is recognized by a NPC which should be at a location, but is completely gone when viewed by someone else.

Player phasing is recognized by not being able to see a player. Early uses of this was death, stealth and invisibility effects which caused the server to only show hidden players to certain people.

Game object phasing is the easiest to recognize and usually requires multiple phasing techniques. Game objects can be anything from a chair or chest, to a building. In most cases, players that can interact with phased buildings must also be phased, otherwise it would appear that players were walking in the air.

Types of Phases

In Wrath, phasing is implemented in three different, and quite distinct, ways. The first is the phased instance. The only example introduced in the Wrath of the Lich King was the Death Knight starting area. Beginning Death Knights are not actually in a phased section of the Eastern Plaguelands, they are actually in a large instance modeled after the eastern portion of the zone, similar to the way Old Hillsbrad is an instance modeled after a portion of Hillsbrad Foothills. This is indicated by the fact that the starter area is surrounded by invisible walls that prevent players from leaving, as well as the fact that players have a different General and Local Defense chat channel.

Second, there are temporary phases, like Fleshwerks in Icecrown. Once you complete the quests that the area is phased for, it returns to normal. There are a few other examples, such as the phase you enter in Zul'Drak when riding Gymer. There is also the Court of Bones in Icecrown, which only phases if you have certain quests from the Argent Tournament.

Finally, there are permanent phases, where you are unlocking an area, such as Shadow Vault and Dun Niffelem. Often, these areas are changed through a series of phases, and once the quest chain unlocking the area has been completed, the character will always see the area in its new state.

A form of the permanent phase, terrain phasing, makes an introduction with Cataclysm. This phasing involves changing the land around you, which happens like other phases, through quests and events.


"Sharding" is when different player characters are stuck in two incompatible phases and cannot see or interact with each other. This is indicated by a transparent portrait and an icon with a swirl pattern on it next to said portrait.


Usage before Wrath of the Lich King

WoW Icon update.png This section concerns content related to the original World of Warcraft.

Before Wrath of the Lich King, phasing was used in stealth and invisibility mechanics. Events such as the opening of Ahn'Qiraj and the taking over of the Isle of Quel'Danas were simply different realm databases adding game objects and NPCs for all players.

Phasing was invented as a bug fix for the climax of the Ogri'la introduction quest chain in Blade's Edge Mountains: N [70G] Into the Soulgrinder.[1] It was later used for the Blade's Edge Shattered Sun Offensive daily quests: N [70 Daily] Intercepting the Mana Cells† and N [70 Daily] Maintaining the Sunwell Portal.

In Wrath of the Lich King

Wrath of the Lich King This section concerns content related to Wrath of the Lich King.

In World of Warcraft: Wrath of the Lich King, Blizzard has made full use of this system. The most well-known examples are Acherus: The Ebon Hold, which looks different to the character depending on his progress through the DK questline, and the Angrathar the Wrathgate line of quests, which end with A [74] The Battle For The Undercity for Alliance characters and H [74] The Battle For The Undercity for Horde characters.

To characters having completed the questline, Alexstrasza is located in front of the Wrathgate and Varimathras, who was killed along with Grand Apothecary Putress, will no longer be in Undercity. For players on certain steps of the quest, the Undercity will also be inhabited by demons. Another example is the existence of Alliance NPCs in front of the Undercity which are not visible to players in a different phase of the quest.

Phasing is also used in (not by far a complete list):

In Cataclysm

Cataclysm This section concerns content related to Cataclysm.

Prior to Cataclysm, phasing was unable to change the base terrain of the world. This means that the normal ground could not change in texture or positioning. An example would be the Court of Bones at the Wrathgate having burnt ground prior to being burned by the Red Dragonflight.

Cataclysm changed those limits. Terrain became able to phase, land could sink beneath the waves as well as rise above them. A raging fire was able to expand further along as time moves forward. Whole mountains crumbled and fall leading way to new lands. With this technology, you could see, for example, a harbor built before your eyes, without the use of in-game patches.

Phasing plays a huge role in Cataclysm, and not just in the newly made zones, but a good amount of the revamped zones as well. A few of the known phase changes are that of the starting areas for the newly announced races of goblins and worgen, in much of the same way the Death Knight starting zone was handled, except with the new terrain phasing feature.


Gathering issues

It appears that if a resource object - such as a herb or mining node - is located in an area that changes due to phasing, the object can be seen from outside that area but disappear when you enter it. Notably, it is still possible to fish from a invisible fishing pool as long as your bobber is where the pool is. You can easily check this by looking at the number of the acievement  That's A Lot of Bait and its follow-ups whenever you fish a fish.

See also


  1. ^ Chris Remo 2009-09-24. Interview: Blizzard's Afrasiabi On WoW's Cataclysm-ic Expansion. Gamasutra. Retrieved on 2010-11-18. “Absolutely. It's actually interesting. Initially, we created phasing as a bug fix. It was used to fix a bug with the Blade's Edge quest.”