Kaldorei society and rank has always been complex. Queen Azshara had her court, the Highborne represented the upper reaches of society, and those chosen Highborne were magic users of particular skill and prowess. On the other end of the spectrum were the Sisters of Elune, kaldorei priestesses who were dedicated to the worship of the moon goddess Elune. And somewhere in between were the druids, primarily male kaldorei who followed Malfurion Stormrage after the War of the Ancients and Sundering were over, eventually founding the Cenarion Circle.
In between them all were the Watchers, a group established after the War of the Ancients that survives to this day. Not only has it survived, it's apparently thriving enough that some of these Watchers will be making an appearance in Warlords of Draenor. While the depth of their appearance and how much they will be contributing to the new expansion's story remains to be seen, it's worth it to take a look at this organization, how it came to be, and perhaps the most notorious Watcher of them all -- Maiev Shadowsong.