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 for an Armbrace of Truth, which can be traded to the Deacon of Whispers for a gold tormented item.