This article is a copy of "The Warcraft Encyclopedia," an official article by Blizzard Entertainment. It presented information about a variety of things in the Warcraft universe. The original article, formerly located at http://www.worldofwarcraft.com/info/encyclopedia/index.xml, did not survive the overhaul of the World of Warcraft Official Website.
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Many immortal and near-immortal creatures exist in Warcraft. A number of these creatures are fundamentally incorporeal beings, but others lead a primarily physical existence.
The Nature of Immortality
Immortals in Warcraft are generally resistant to sickness and injury, but immortality does not confer invulnerability. Immortal beings can still be wounded and even killed. Indeed, many immortals have perished over the course of recorded history, particularly during the War of the Ancients. The death of an immortal is just as real as any mortal death and, barring a few extraordinary cases, just as permanent.
What, then, does the term immortality mean in Warcraft? Immortal creatures essentially stop aging when they reach adulthood, and thus, they cannot die merely from old age. In addition, they tend to be more powerful than most mortal creatures, although this tendency does not always hold true. Even godhood itself is no guarantee of superior might. Consider the titans' defeat of the Old Gods. The titans are not gods, but their vast power allowed them to imprison the Old Gods far below the surface of Azeroth.
Furthermore, immortality need not be a lasting state of affairs. The night elves, for example, were immortal for thousands of years, but sacrificed their immortality during the Third War. Today they are a mortal race, and they are accordingly classified as such, rather than listed herein.
Last but not least, there are creatures that can be considered nearly immortal. Technically these beings are mortal, but for one reason or other, they have a lifespan that greatly exceeds several millennia. Indeed, these mortal creatures might even be considered effectively immortal due to some external factor, as with Ysera's consorts, who almost never emerge from the Emerald Dream.
The information could still retrieved from http://www.wow-europe.com/en/info/encyclopedia/index.xml.