Relatively speaking, Humanity is one of the youngest races of the world. Unlike Elves and Dwarves, Humans live brief lives full of change and strife. Thus, Humanity pushes itself to achieve great heights in empire building, technology, and magical study. It is for this reason that Human kingdoms have expanded so drastically in such short periods of time. Overall, Humanity values virtue and honor and seeks only to safeguard itself against the forces of darkness. Aided by the Holy Light, Humanity has fought the hardest and suffered the most during the war against the Orcish Hordes.
The savage, green-skinned Orcs are one of the most prolific races of the Warcraft world. Born on the hellish world of Draenor, the Orcs were brought into the kingdom of Azeroth through the dimensional gateway known as the Dark Portal and forced to make war upon the Humans. The Orcs are typically believed to be brutal and mindless, possessing no humanity or empathy for other races. Although few are aware of it, the Orcs once cultivated a noble, Shamanistic society on the world of Draenor. Yet the proud Orc clans were corrupted by the Burning Legion and used as pawns in the Legion's invasion of Azeroth. In recent years the Orcs have begun to release themselves from the Demons' corruption, and rekindle their ancient, noble traditions.
Night Elf Sentinels
The reclusive Night Elves were the first race to awaken in the World of Warcraft. These shadowy, immortal beings were the first to study magic and let it loose throughout the world nearly ten thousand years before Warcraft I. The Night Elves' reckless use of magic drew the Burning Legion into the world and led to a catastrophic war between the two titanic races. The Night Elves barely managed to banish the Legion from the world, but their wondrous homeland was shattered and drowned by the sea. Ever since, the Night Elves refused to use magic for fear that the dreaded Legion would return. The Night Elves closed themselves off from the rest of the world and remained hidden atop their holy mountain of Hyjal for many thousands of years. As a race, Night Elves are typically honorable and just, but they are very distrusting of the 'lesser races' of the world. They are nocturnal by nature and their shadowy powers often elicit the same distrust that they have for their mortal neighbors.
The horrifying Undead army called the Scourge consists of thousands of walking corpses, disembodied spirits, damned mortal men and insidious extra-dimensional entities. The Scourge was created by the Burning Legion for the sole purpose of sewing terror across the world in anticipation of the Legion's inevitable invasion. The Undead are ruled by Ner'zhul, the Lich King, who lords over the icy realm of Northrend from his frozen throne. Ner'zhul commands the terrible plague of undeath, which he sends ever southward into the human lands. As the plague encroaches on the southlands, more and more humans fall prey to Ner'zhul's mental control and life-draining sickness every day. In this way, Ner'zhul has swelled the ranks of the already considerable Scourge. Though Ner'zhul and his Undead Scourge are bound to the will of the Burning Legion, the Lich King constantly strives to free himself and gain vengeance upon the demons for damning him so completely.