- "It turns their lips blue, and their minds soft. They actually believe their parlor tricks are magic."
- ―Xaro Xhoan Daxos
Shade of the evening is a beverage commonly drank by the warlocks of Qarth. It is the cause for their blue lips. The Warlocks believe that drinking large quantities of shade of the evening grants them magical powers.
Daenerys is at a reception at the home of Xaro Xhoan Daxos, when the Warlock Pyat Pree shows up and does a trick where he appears to be replicated, then he invites her to visit the House of the Undying. After he leaves, Xaro comes over and apologizes. As a member of the The Thirteen, Pree got an honorary invitation. When asked about the House of the Undying, he tells Daenerys that it is where the warlocks gather to drink shade of the evening, which turns their lips blue and their minds soft. He then dismisses their magic as parlor tricks.
Daenerys' ship travels west from Qarth and arrives at the city of Astapor in Slaver's Bay. Soon after she arrives, a Warlock sent from Qarth who is disguised as a small child attempts to assassinate Daenerys with a poisonous Manticore, but the attempt is foiled by Ser Barristan Selmy. The "child" Warlock hisses at them from the distance, revealing that its lips are stained blue by shade of the evening.
In the books
In the A Song of Ice and Fire novels, shade of the evening is a thick blue beverage made from the inky blue leaves of the trees that grow outside the House of the Undying. It is drunk by those who enter the House of the Undying, so that they may "hear and see the truths" that will be laid before them. It does not turn lips blue with just one dose; many must be drunk. It smells like rotted flesh, has an oily texture, and tastes like all the tastes a person has ever tasted, and some that a person hasn't.