Breaching the Stygian Veil

Objectives

 * Defeat the approaching demon hordes.
 * Destroy the Demon Underlords to release the magical bindings placed on the entrance to the spawning tunnels. 0...2 of 2 Demon Underlords remain.
 * See Adept of Whispers for your reward.

Reward

 * 10,000 Experience
 * 500 Gold
 * 500 Lightbringer Promotion Points

Walkthrough
During the first part of this quest, eighteen groups of six Stygians attack, organized into three sets of six groups. The first three groups attack once the quest is taken, and converge near the Adept of Whispers. Whenever a group is defeated, the next group in the set will attack. Some groups consist entirely of Stygian Hungers, against which most traditional tanking strategies are ineffective. They use PBAoE and non-spell touch skills, which bypass defensive skills like Obsidian Flesh and Shadow Form, shadow damage skills, which bypass armor, life stealing, which bypasses armor and damage reduction. A large group of Stygian Hungers can quickly spike a single tank to death. Effective strategies include trapping, spiking or bringing several party members with Ursan Blessing to knock down the Hungers and spread out damage or increasing the tank's maximum health with skills such as Signet of Stamina. Traditional tanking is effective against other monsters in the area. Each group can be individually pulled.

After all the waves have been defeated, your party must defeat the two Stygian Underlords, located at the far ends of the northern and southwestern hills. The hills have numerous popups. Most monsters on the hills can be individually pulled. The Underlords themselves are similar in power to the regular Stygians.

Foes
Demons
 * 24 (26) Torment Claw
 * Stygians
 * 28 (30) Stygian Brute
 * 28 (30) Stygian Horror
 * 28 (30) Stygian Fiend
 * 26 (30) Stygian Underlord
 * 28 (30) Stygian Hunger
 * 28 (30) Stygian Golem
 * 26 (30) Stygian Underlord
 * Torment creatures
 * 28 (30) Water Tormentor

Initial dialogue
Adept of Whispers
 * "If we are to defeat the Dreadspawn Maw, we must fight our way through her children. Some will be fully-formed demons, but many of her spawn will only be half-formed and not yet have their full strength. One thing you can be certain of...the Maw's demonic forces will be near boundless. Will you help me fight past the demonic hordes?"

Reward dialogue
Adept of Whispers
 * "Now that we have weakened the Dreadspawn Maw's demonic forces, we must proceed into the spawning tunnels and destroy the Stygian Lords. Speak to me again when your ready."