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Undermine is the 3rd quest in the Attack on Stormreach story arcIcon tooltip.pngStory arcs  are chains of quests that make up a story line.
Completing everything in a story arc often yields a nice reward.
The first three quests can be completed in any order to unlock Siegebreaker.
Assault on Summerfield • Blockade Buster • Undermine • Siegebreaker

Coin Lord Varen Lassite has asked you to investigate the strange rumbling sounds coming from Lordsmarch Plaza.

The Droaam army has neither the supplies nor the patience for a drawn-out siege. They need a way to bypass Stormreach's defenses and force the city to surrender.

Attack on Stormreach adpack icon.jpg
DDO Point icon.png Requires access to adventure pack: Attack on Stormreach
Heroic level: 13
Epic level: 34
(considered Legendary)
Duration: long
Heroic XP:  ♣3,069Solo/Casual ♦5,355Normal ♥5,593Hard ♠5,832Elite
Epic XP:  ♣18,844Solo/Casual ♦32,148Normal ♥32,889Hard ♠33,630Elite
Takes place in: Sapper Tunnel
Bestowed by: Varen Lassite
NPC contact: Varen Lassite
Quest acquired in: Lordsmarch Palace
Patron: The Coin Lords
Base favor: 6
Purchase: Attack on Stormreach or VIP
Extreme Challenge: No
M undermine.png
Undermine boulder mine placement.png
Loading screen


Coin Lord Varen Lassite asked you to find out what's causing the strange sounds heard near the Palace recently. The sounds seem to be coming from Lordsmarch Plaza. Varen suspects that the sounds are the precursor to some sort of Droaam attack.

Spoiler Warning: Spoiler material below this point!


  • Help Guard Captain Tollis investigate the noises in the Plaza
  • Kill Kaboom the Demolitions Master
  • Find the other end of the Droaam tunnel
  • (Optional) Destroy Rhyolite — Bonus (20%): Heroic( ♣614 ♦1,071 ♥1,119 ♠1,166 ) Epic( ♣3,769 ♦6,430 ♥6,578 ♠6,726 )
  • (Optional) Destroy Cascade — Bonus (20%): Heroic( ♣614 ♦1,071 ♥1,119 ♠1,166 ) Epic( ♣3,769 ♦6,430 ♥6,578 ♠6,726 )
  • (Optional) Destroy Rock Wall — Bonus (15%): Heroic( ♣460 ♦803 ♥839 ♠875 ) Epic( ♣2,827 ♦4,822 ♥4,933 ♠5,045 )
  • (Optional) Destroy the rolling boulder — Bonus (15%): Heroic( ♣460 ♦803 ♥839 ♠875 ) Epic( ♣2,827 ♦4,822 ♥4,933 ♠5,045 )

What to Expect

  • Spawning/respawning monsters

Known Traps

Trap DCs

  • A rolling boulder appears in a long tunnel, located after a bridge near a shrine near quest's end. It can be destroyed by a quick ranged attack, with several physical spells such as Blade Barrier and Disintegrate, or with proper timing using a Droaam explosive set to destroy the boulder. (The boulder was destroyed with 465HP on Normal). The boulder does massive HP damage and knockdown; direct attack is not recommended.
    • To destroy the boulder with an explosive charge, view the Explosive placement image (second map).
  • There is a huge minefield, which can either be blown up step by step with the explosives, or one character with good armor and reflex saves may tumble through or with a Jump spell you can jump and walk on the elevations. Alternatively, one can simply sneak through without setting off the explosives – but watch out for the guards at the other end of the minefield as you'll be in close proximity and might be detected with a low Hide or with Invisibility alone.
    • As of Update 59, the minefield can be disabled in sections.
    • Interestingly, a Thief Acrobat Rogue, trained with Kip Up (immunity to knockdown) and a high Reflex can literally run through the minefield, setting off the landmines without injuring themselves. Use Invisibility and the landmines near the enemies ahead might take them out as well with little time for them to shoot at you.

Tips and Misc

Second Loading Screen
  • The quest begins in an quest instance of Lordsmarch Plaza, where a massive explosion allows several waves of Droaam forces to invade. You must fend off these enemies before entering the tunnel they created. There are numerous guards around the courtyard who can help you if you kite an enemy around to them. However, the guards are fairly weak and will die quickly unless healed often. The Droaam forces will patrol the area in a set pattern (from the palace entrance to the Marketplace entrance) if there are no enemies visible when they spawn. Individual Droaam soldiers can then be pulled away from the group as they patrol and dealt with singly.
  • The Droaam explosive charges have an extreme area of effect. Rogues with Mechanic enhancements Improved Traps Tier 1 can set charges in half the time of other players. Artificers with Tier 3 Field Engineer can take damage while setting traps. Traps do 1000–2000 Fire Damage. Do not have any players or hirelings linger close to the explosion or death is probable. If you are Sneaking when you set a charge, you will be knocked out of stealth mode, when the charge sets (at the end of the channel). However, you can immediately re-enter Sneak IF you are not in line of sight of any creature. That is, if you are behind a creature, it will not detect you unless you move before you re-enter sneak.
  • Mind-controlled creatures will die from an explosion and count as kills
  • If soloing as a rogue, when you first acquire Droam explosive charges, immediately set one against the wall behind you in order to kill the elemental that spawns there before it spawns.
  • Breakables broken by explosions do not count (barrels on tunnel to optional at shrine)
  • Rhyolite appears in the first cavern when you blow up the first pile of rubble. A stealthy character can kill him with a Droaam explosive charge without being detected. If his target upon which he's aggravated leaves the cavern, he will return to his spawn and become an indestructible obstacle, permanently blocking passage to the shrine and chest in his cavern.
  • Rock Wall spawns in the side chamber sealed off by rubble.
  • The wooden floor near one set of shrines (and many explosive barrels) can be destroyed with a demolition charge, revealing the underwater path to where Cascade spawns.
  • Mines can be blown up with demolition charges.
  • Kaboom, the end-boss, appears at the start of the quest but cannot be killed until the end-fight. Have fire resists ready throughout the quest as he uses mines, and many other kobolds use fire attacks as well as Sunburst.
  • At the end fight, Kaboom will run away when his health is low, dropping mines in his wake. More importantly, he will also drop one or more Droaam explosive charges (know what they look and sound like, better yet practice with the ones you picked up earlier, so everyone in party knows) ... so, as soon as he turns to run be *very* careful to stay away from the Droaam charges he drops, they will typically kill you instantly if you are too close.
    • He drops the bombs in a circle on the east side of the room (the traps shown on the map reflect this). Fight him on the west side of the room to avoid trouble.
    • As a rogue or other high stealth character, you can complete the entire end fight without directly engaging him, however. Simply use the Droaam explosive charges to clear out all of the enemies without being detected, then use the charges on Kaboom himself. Sneak up behind him, set a charge, re-enter sneak, and get away. Repeat until dead.
  • Once the quest is completed, you will reuse this tunnel (which will now appear for completing players in the public instance of the Plaza) to complete the final quest in the arc, Siegebreaker.

Bonus XP

  • Aggression bonus: 141 or more monsters killed +10% Bonus.( ♣307 ♦536 ♥559 ♠583 )
  • Onslaught bonus: 182 or more monsters killed +15% Bonus.( ♣460 ♦803 ♥839 ♠875 )
  • Conquest bonus: 220 or more monsters killed +25% Bonus.( ♣767 ♦1,339 ♥1,398 ♠1,458 )
  • Tamper bonus: 209 or more traps disarmed +10% Bonus.( ♣307 ♦536 ♥559 ♠583 )
  • Neutralization bonus: 272 or more traps disarmed +20% Bonus.( ♣614 ♦1,071 ♥1,119 ♠1,166 )
  • Ingenious Debilitation bonus: 335 or more traps disarmed +30% Bonus.( ♣921 ♦1,607 ♥1,678 ♠1,750 )
  • Mischief bonus: 51 or more breakables smashed +8% Bonus.( ♣246 ♦428 ♥447 ♠467 )
  • Vandal bonus: 68 or more breakables smashed +10% Bonus.( ♣307 ♦536 ♥559 ♠583 )
  • Ransack bonus: 82 or more breakables smashed +15% Bonus.( ♣460 ♦803 ♥839 ♠875 )
Notes: Breakables destroyed by Droaam explosives do not count towards your total. Break them manually if you want Ransack.
The landmines in the minefield can be disabled as traps. Bring extra tools if you want the bonuses. (DDO Forums)


  • Chests: 4
    • 1 optional for killing Rhyolite (Earth Elemental, found in the first cavern when you blow up the first pile of rubble)
    • 1 optional for killing Rock Wall (Earth Elemental, found in a side chamber sealed off by rubble)
    • 1 optional for killing Cascade (Water Elemental, found past an underwater passage revealed by blowing up the wooden floor near a set of shrines and many explosive barrels)
    • 1 at the end for killing Kaboom the Demolitions Master (Kobold)
  • Collectables: 6
    • Mushroom near Rock Wall
    • Mold in the cavern with many crates
    • Mushroom on a ledge early in the minefield
    • Fungus further into the minefield west
    • Mushroom just after the bridge
    • Fungus in the last cavern east
  • NPC rewards: Standard

Named Chest Drop

Last Edited Item Type Enhancements ML Bind Quests
Crimson Chain
Crimson Chain.png
Chainmail  12 Bound to Account on AcquireIcon tooltip.pngBound to Account on Acquire: This item is Bound to Account on Acquire Undermine, Rhyolite's chest
  • Update 59.0.1
  • 4 months and 20 days
  • Cru121
Legendary Crimson Chain
Legendary Crimson Chain.png
Light Armor  31 Bound to Account on AcquireIcon tooltip.pngBound to Account on Acquire: This item is Bound to Account on Acquire Undermine, Rhyolite's chest
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Name ( picture ) CR Type Race
Blitz( view
 • edit )
 ♠21Elite Giant Ogre
Cascade( view
 • edit )
 ♠21Elite Elemental Water Elemental
Droaam Combat Engineer( view
Droaam Combat Engineer.jpg
 • edit )
 ♥14Hard ♠17Elite Reptilian Kobold
Droaam Conscript( view
Droaam Conscript.jpg
 • edit )
 ♦10Normal ♥12Hard ♠15Elite Orc Half-Orc
Droaam Digger( view
Droaam Digger.png
 • edit )
 ♥9Hard ♠12Elite Reptilian Kobold
Droaam Gnoll Archer( view
Droaam Gnoll Archer.png
 • edit )
 ♥15Hard ♠18Elite Gnoll Gnoll
Droaam Infantry( view
Droaam Infantry.jpg
 • edit )
 ♦13Normal ♥15Hard ♠18Elite Orc Orc
Droaam Sapper( view
Droaam Sapper.png
 • edit )
 ♥10Hard ♠13Elite Reptilian Kobold
Droaam Skirmisher( view
Droaam Skirmisher.jpg
 • edit )
 ♦11Normal ♥13Hard ♠16Elite Orc Half-Orc
Droaam Vanguard( view
Droaam Vanguard.jpg
 • edit )
 ♦14Normal ♥16Hard ♠19Elite Giant Ogre
Droaam Warmage (gnoll)( view
Droaam Warmage (gnoll).jpg
 • edit )
 ♦13Normal ♥15Hard ♠18Elite Gnoll Gnoll
Droaam Warpriest( view
Droaam Warpriest.jpg
 • edit )
 ♦13Normal ♥14Hard ♠17/18Elite Gnoll Gnoll
Elder Earth Elemental( view
Elder Earth Elemental.jpg
 • edit )
 ♦13Normal ♥15Hard ♠18Elite Elemental Earth Elemental
Kaboom( view
 • edit )
 ♠22Elite Reptilian Kobold
Rhyolite( view
 • edit )
 ♠21Elite Elemental Earth Elemental
Rock Wall( view
Rock Wall.jpg
 • edit )
 ♥18Hard ♠21Elite Elemental Earth Elemental
Rolling Boulder( view
Rolling Boulder.jpg
 • edit )
 ♠18Elite Construct Inanimate Object
Worg Warhound( view
Worg Warhound.jpg
 • edit )
 ♠18Elite Magical Beast Wolf