Demoniac's Threads

Demoniac's Threads is the Zandalar Tribe set for warlocks.

Source
Most Demoniac's Threads items can be acquired through quests given by Al'tabim the All-Seeing, who can be found on the Yojamba Isle in Stranglethorn Vale.

The exception is Hazza'rah's Charm of Destruction, which is formed by combining a Punctured Voodoo Doll (warlock) with Gri'lek's Blood, Renataki's Tooth, Wushoolay's Mane, and Hazza'rah's Dream Thread.

In the RPG
Demoniac Jewels: "It is said that the witchcraft used to empower these ghoulish accessories is similar to the dark magic employed by the Atal'ai priests of the fractured Gurubashi empire. Only the most accomplished troll priests are capable of crafting these macabre artifacts without falling under the sway of the malevolent powers they must wield to do so."