Drow

In the Anchored Worlds campaign setting, the term "drow" refers very specifically to the mountain elves living in the city of Menzoberranzen and Ched Nasad, who follow the Church of Lolth.
Lolth-sworn Drow have been magically altered so that they can be instantly recognized. They almost always have white hair and red eyes. This is a show of magical favor from their goddess, who has a fondness for those colors. They also typically have black or grey teeth, and bright red gums, tongue, and throats. Lolth-sworn women are also taller and stronger than their men. They may also rarely have some other interesting features.

The Cult of Lolth

The Cult of Lolth (though they call themselves a Church) is contained to two city-states, though they are constantly trying to extend their influence beyond.
Under Lolth’s rule, some aspects of existing drow culture are magnified. For instance, far past being matriarchal, Lolth has an active disdain for men due to several drow heroes who directly opposed her takeover…and were all, coincidentally, men. For this, she punishes all drow men. This bleeds through to her followers. In ordinary drow society, sons are not favored but are still cherished and allowed many of the same rights of women, but little authority. Under Lolth, however, men are close to second-hand citizens. A man is considered to be a caste below the women in his family. Men on the lowest class are essentially slaves. Though they cannot be traded as slaves can, they have little rights and are entirely at the mercy of their matriarchs.
To distinguish her drow from “the rabble,” Lolth changed her earliest followers physically, and the changes slowly spread as worship did. Those in the Underdark can tell a Lolth-sworn from a mile away, and know to avoid them. Lolth is also far less strict on body modification and hair length, allowing tattoos, piercings, and even cutting one’s hair. She delights in the inner conflict this causes, as the drow’s cultural sensibilities clash with the freedom their goddess allows.
Another aspect she magnifies, which was the primary reason she chose the drow as her first worshippers, is the ambition. While drow culture believes everyone has a “true” place and your life’s goal is to achieve it by any means, Lolth encourages her followers to always strive to go above and not settle, even if you feel what the drow refer to as “divine contentment” with your place. She delights in the sadism and chaos she sows among her followers.
While typical drow culture views violence as another art form to be perfected, Lolth favors brutality, sadism, and even desecration, pushing her followers to the brink of their sensibilities and beyond. Her followers have a reputation for treating those they kill and capture with a uniquely twisted form of sadistic torture.
Lolth is the patron of weavers, fiber crafters, and metalworkers. She placed a high importance on those particular crafts, and had a love of woven beauty. Of course, spiders and webs are a large motif that can be found in Lolth-sworn art, as well as the colors red and white. She favors these, and may even punish someone who creates a masterpiece that doesn’t meet her preferences.
Lolth desires to one day have all elves under her rule, and her followers sometimes attack other mountain elves to be brought back as slaves and indoctrinated. Drow captured in this manner are an abnormality in society. These individuals (and only them) may be freed from slavery by marrying or being adopted into a House or family, only after swearing fealty to Lolth and passing a trial of faith. These drow are especially favored by Lolth and her worshippers, who sees them as the ultimate triumph of their faith.
One interesting, and potentially tragic, quirk of drow born into Lolth’s cult is that, unlike all other elves including other mountain elves, they do not see their past lives when they meditate. It is unclear whether this is because they do not reincarnate or if Lolth is somehow suppressing their connection to their past lives. Some of the opponents of Lolth’s cult believe that she takes her followers’ souls when they die, though for what purpose is unclear.
As stated above, Lolth frequently changes the rules of her cult. However, three rules have never changed:

1. Worship only Lolth, and put her first. (Worship or fealty to any other god is forbidden, and Lolth demands total obedience. She even asks her worshippers to put her above even their mother and matriarchs, a challenging concept for many drow.)
2. Second to Lolth is the brood. (Protect kin at all costs. House first, then family, then all drow. She also demands they protect and cultivate spiders, including a demonic breed she created for this very purpose.)
3. Dig deeper into the darkness. (Be ruthlessly ambitious, do whatever it takes to survive and thrive. Take every avenue of power available to you.)