Stygian Gemstone

Stygian Gemstones are a type of Anguish Gemstone. They are gold items.

Acquisition
Quest reward:
 * Mallyx the Unyielding

Loot:
 * Stygian Brute
 * Stygian Fiend
 * Stygian Horror
 * Stygian Hunger
 * Stygian Lord
 * Stygian Underlord

Chest:
 * The Stygian Chest that appears after killing the Dreadspawn Maw contains one Stygian Gemstone for each party member.

Uses

 * Four Anguish Gemstones (one of each type) must be traded to Keeper Millzesh in Abaddon's Gate in order to complete the Finding a Purpose quest and recruit Razah in PvE.
 * Four Anguish Gemstones (one of each type) can be traded to the Keeper of Secrets in Gate of Anguish for a Coffer of Whispers.
 * 60 Anguish Gemstones (15 of each type) can be traded to the Spirit of Truth in the City of Torc'qua for an Armbrace of Truth, which can be traded to the Deacon of Whispers for a gold tormented item.