Paladins are the virtuous defenders of the weak and tireless, unfaltering enemies of the undead. Mixing elements of the warrior and the clerics of the Holy Light, the paladin is a tough melee fighter. The tradition of the Holy Light is unique to a few of the Alliance races (humans, dwarves, and draenei.) and the blood elves and tauren of the Horde.The paladin is a "warrior of the Holy Light". They uphold all that is good and true in the world and revile all that is evil and sinister — especially undead and the Burning Legion. They offer succor to the beleaguered and smite their enemies with holy fervor. They are particularly potent against undead, as these creatures threaten the goodly races and the Holy Light burns them terribly. The presence of any evil is reprehensible to the paladin, but he focuses his efforts on destroying undead and demons. These warriors uphold the tenets of the Holy Light and defend the Alliance from the predations of any threat to their peoples. Found in almost every corner of Azeroth fighting the forces of evil and barbarism, these stalwart warriors of faith ceaselessly uphold their vigil against demonic forces from beyond the Dark Portal. Humans, draenei, and Ironforge dwarves are the most likely to become paladins, as these races revere the Holy Light. Blood elves known as Blood Knights bend the powers of the Light to their will, though rumor has it they have recently begun to use the Light legitimately. The Tauren recently became paladins in Catclysm, and using power of the Sun, they founded the Sunwalkers. The paladin order, also called the Knights of the Silver Hand, grew out of humanity’s culture, and its greatest heroes and fiercest proponents are humans. Ironforge dwarves possess the toughness needed to withstand the onslaught of the paladins’ many enemies. High elves rarely become paladins, though this has changed somewhat, as their blood elf brothers and sisters expand the Blood Knight order. The Blood Knights are commonly mistaken as the enemy of the Knights of the Silver Hand by outsiders unfamiliar with the ways of the Light, but this is false presumption. Paladins are the embodiment of good and selfless dedication to the protection of their peoples. They help the innocent and punish the wicked. As such, paladins are generally of good alignment. There are however, also Fallen Paladins such as those in the Scarlet Crusade.A dwarf paladin fighting, with the retribution aura, against undead skeletons.During the Second War, some paladins' eyes glowed with inner power of the Light, such as the paladin Turalyon. This is not the case for all paladins, though it occurs in game with certain paladin armor sets.
Code of Conduct
A paladin must be good and will lose all Light-given abilities if he ever willingly commits an evil act. Additionally, the paladin’s code requires that he respect legitimate authority, act with honor (not lying, not cheating, not using poison and so forth), help those in need (provided they do not use their help for evil or chaotic ends), and punish those who harm or threaten innocents. While he may adventure with others from different orginizations, a paladin will never knowingly associate with evil persons, nor will he continue an association with someone who consistently offends his moral code. A paladin may accept only henchmen, followers or cohorts whose intentions are good. A paladin who violates this code, becomes an ex-paladin, and loses all Light-given abilities until he atones for his violations.In exceptional circumstances a Paladin may act unlawfully if they are certain it is for the greater good (for example, they can turn against their current master if he turns out to be evil) but they must never work for unjust or evil causes knowingly. Since a Paladin believes in honesty, honour and loyalty, even pretending to support what they know is an unjust cause in order to bring down a greater evil is heavily frowned upon Paladins don't always have to work within good or neutral organizations as seen by the Scarlet Crusade and others — however, they do have to believe they are working for good organizations or have faith that their cause is good and just. A paladin can be evil (as illustrated by Renault Mograine and Arthas before he took up Frostmourne, but his holy powers did start to weaken after he culled Stratholme; the further down the dark path he went, the more they faded until eventually left him), but as long as they believe their cause to be just, the Light will continue to serve them All information from Alteria Enji and WoW