Singular form: satyr
As the chief counselor of Queen Azshara, Lord Xavius was given the responsibility of guarding the portal between the planet Azeroth and the Twisting Nether during the War of the Ancients. Xavius was defeated and slain by the druid Malfurion Stormrage, who subsequently destroyed the portal.
The First Satyr
Sargeras, creator of the Burning Legion, was enraged by Xavius' failure and tortured his disembodied spirit for some time before deciding that Xavius might, after all, still prove useful. To that end, Sargeras created a new body for Xavius, who became the first satyr in existence. From the waist up, Xavius resembled his former night elf form, but his fingers now sported a set of sharp claws, and his head bore two horns. His goat-like lower body, however, had hooves and a long leonine tail.
Pleased with his creation, Sargeras sent Xavius back to Azeroth to further the Legion's ends. Xavius spread the demonic curse to other creatures--at first primarily other power-hungry Highborne who lived in Zin-Azshari. Despite the fact that Malfurion ultimately destroyed Xavius again, satyrs worship Xavius to this day in the hope that he will again return to Azeroth and lead them.
Nor are the satyrs the only ones who invoke Xavius' name. Scattered individuals venerate Xavius because they hope to become satyrs themselves. Fortunately such practices are not widespread.
Description
All satyrs have been transformed into their current shapes by inheriting the demonic curse that originated with Xavius. These immortal demons delight most in inflicting emotional and physical pain upon their enemies. Both spellcasters and non-spellcasters have joined the ranks of these bestial demons, who have increased physical strength and an incredible talent for manipulation.
Like Xavius, all satyrs have the ability to pass their curse on, and they have gleefully done so. The curse has therefore continued to spread, although it has weakened over time, and so very few satyrs are still being created. New satyrs can only be created by preexisting satyrs.
Over time the satyrs discovered that they could pass their curse on to races other than the night elves. Although most satyrs today are former night elves, satyrs have therefore also been created out of other races. According to scattered reports, there are both male and female satyrs; however, researchers have failed thus far to secure irrefutable evidence of female satyrs on Azeroth.