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A terrible scourge stalks the subterranean world of the Waterworks...twisted entities from beyond space and time.

Heroic level: 12
Epic level: None
Duration: Very Long
Heroic XP:  ♣2,460Icon tooltip.pngSolo/Casual ♦4,299Icon tooltip.pngNormal ♥4,500Icon tooltip.pngHard ♠4,700Icon tooltip.pngElite
Epic XP: N/A
Takes place in: Waterworks - Side Entrance
Bestowed by: Guard Branson
NPC contact: Guard Branson
Quest acquired in: The Harbor
Patron: The Coin Lords
Base favor: 7
Free to Play: Yes
Extreme Challenge: No
M invaders.png
Loading screen


Note: Although this quest uses the same map as The Waterworks, the quest entrance is via a sewer cover located northwest across the water from the entrance to that area.

The Gnashtooth and Tunnelworm kobolds were at war with one another...until now. Invading forces from Xoriat plan to destroy Stormreach and wreak havoc across Xen'drik. They gather their warriors inside the Waterworks, using human cultists to open dark portals to their world. You must enter the Waterworks to stop the invaders.

Spoiler Warning: Information below this point can be considered spoiler material!


  • Kill Elder Beholder maintaining the Gnashtooth locus
  • Kill Elder Beholders maintaining the central loci
  • Kill Elder Beholder maintaining the Tunnelworm locus
  • Slay the demons' commander
  • (Optional) Slay 40 outsiders +20% Bonus.( ♣492 ♦860 ♥900 ♠940 )
  • (Optional) Slay 80 outsiders +30% Bonus.( ♣738 ♦1,290 ♥1,350 ♠1,410 )
  • (Optional) Slay 120 outsiders +40% Bonus.( ♣984 ♦1,720 ♥1,800 ♠1,880 )
  • (Optional) Slay 150 outsiders +50% Bonus.( ♣1,230 ♦2,150 ♥2,250 ♠2,350 )

What to Expect

Tips and Misc

This is an exceedingly difficult quest for the unprepared. There are at least 10 beholders that must be slain, including some that can't be ranged, surrounded by portals that respawn Flensers, Hounds and the like. Death to at least one in your party is likely; someone that can raise the dead is almost a necessity. Chaos orbs move around near objectives (like the ones in The Xorian Cipher) which throw random spells if they come too close to you. Beholders abound, as noted, dispelling your buffs and casting Finger of Death and Disintegrate on you. The slippery ground caused from Ice Flensers' area cold effects make a bad situation worse.

Deathblock items, Negative Energy Absorption items (Beholder Optic Nerves, Silver Flame Nugget), Freedom of Movement, Greater Cold resistance items, and a caster with Restoration or Greater Restoration to restore negative levels are extremely helpful. Dismissal and Banishment are very useful in this quest as well since nearly all of the mobs are extraplanar.

Casters who can switch to an undead form are not affected by negative level drain and can even be healed by negative energy spells cast by a beholder.

Two Elder Beholders are maintaining the central loci: first in the alcove at the very bottom of the map (southwest location), second one in the easternmost alcove which is reached by jumping down in a large chamber. You need to kill both.

See the article on Beholders for tactical options and additional options for protection.

The quest-map is based on the Waterworks Wilderness adventure area, but there are no secret doors or underwater passages. You start in the first "rare" room (troglodyte) to the north, and the Waterworks' entry hall and lower-east "rust monster" hall both contain objectives, and several doors that are empty in Waterworks now contain encounters. If you have run the Waterworks story arc, it will be difficult to get lost and easy to find the objectives.

A single shrine is located in the same place as found in the Waterworks wilderness adventure area, about half-way up the east wing.

To get the optional for 150 kills requires waiting out respawns before completion.

Bonus XP

  • Aggression bonus: 68 or more monsters killed +10% Bonus.( ♣246 ♦430 ♥450 ♠470 )
  • Onslaught bonus: 88 or more monsters killed +15% Bonus.( ♣369 ♦645 ♥675 ♠705 )
  • Conquest bonus: 120 or more monsters killed +25% Bonus.( ♣615 ♦1,075 ♥1,125 ♠1,175 )


  • Chests: 1 placed randomly, 1 after end fight.
At the end chest, certain number of Outsider Tokens are given to players as chest loot, according to what commander they have defeated. Tokens are not guaranteed on casual.
  • Grokien (Beholder) = 5 tokens
  • Boktar (Elder Beholder) = 5 tokens
  • Tyrzza (Thaarak Hound) = 2 tokens
  • Prysuul (Flesh Render) = 2 tokens
  • Garzuul (Fire Reaver) = 3 tokens
  • Tharkuul (Ice Flenser) = 3 tokens
They bind to character on acquire, but you can pass yours to one of your party members before they are looted from chest.
  • NPC rewards: Random item

Named Chest Drop

Depending on the boss, the end chest can contain some of the following items:

You can turn in 25 Outsider Tokens to Phinnian Barkbow in the Harbor to claim a reward from the following list. This quest flag is non-repeatable (once per life).


Name(picture) CR Type Race
Boktar the Elder Beholder(view)
Boktar the Elder Beholder.jpg
 ♦17Icon tooltip.pngNormal Aberration Beholder
 ♦14Icon tooltip.pngNormal ♠19Icon tooltip.pngElite Evil Outsider Demon
No pic.jpg
 ♠16Icon tooltip.pngElite Aberration Beholder
No pic.jpg
 ♠16Icon tooltip.pngElite Evil Outsider Demon
No pic.jpg
 ♠16Icon tooltip.pngElite Evil Outsider Demon
No pic.jpg
 ♦10Icon tooltip.pngNormal ♠16Icon tooltip.pngElite Evil Outsider Hellhound
 ♦14Icon tooltip.pngNormal ♥16Icon tooltip.pngHard ♠19Icon tooltip.pngElite ♦20Icon tooltip.pngEpic Normal ♠66Icon tooltip.pngEpic Elite Aberration Beholder
Elder Beholder(view)
Elder Beholder.jpg
 ♦17Icon tooltip.pngNormal ♥19Icon tooltip.pngHard ♠22Icon tooltip.pngElite Aberration Beholder
Fire Reaver(view)
Fire Reaver.jpg
 ♦12/14Icon tooltip.pngNormal ♥16Icon tooltip.pngHard ♠19Icon tooltip.pngElite ♦15Icon tooltip.pngEpic Normal Evil Outsider Demon
Flesh Render(view)
Flesh Render.png
 ♦12/14Icon tooltip.pngNormal ♥14Icon tooltip.pngHard ♠17Icon tooltip.pngElite Evil Outsider Demon
Ice Flenser(view)
Ice Flenser.png
 ♦14Icon tooltip.pngNormal ♥16Icon tooltip.pngHard ♠19Icon tooltip.pngElite Evil Outsider Demon
Siren of Insanity(view)
Siren of Insanity.jpg
 ♦7Icon tooltip.pngNormal ♥9Icon tooltip.pngHard ♠12Icon tooltip.pngElite Elf Drow Elf
Thaarak Hound(view)
Thaarak Hound.jpg
 ♦10Icon tooltip.pngNormal ♥12Icon tooltip.pngHard ♠15Icon tooltip.pngElite ♦21Icon tooltip.pngEpic Normal ♠44Icon tooltip.pngEpic Elite Evil Outsider Hellhound
Zealot of Madness(view)
Zealot of Madness.jpg
 ♦7Icon tooltip.pngNormal ♥9Icon tooltip.pngHard ♠12Icon tooltip.pngElite Elf Drow Elf

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