Underground Facility Fractal
Underground Facility Fractal
Map of Underground Facility Fractal
- Levels
- 80
- Type
- Fractal
- Dungeon
- Fractals of the Mists
- API
- 953
Image(s) |
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“Delve deep into an underground dredge facility.
— In-game description
The Underground Facility Fractal is one of the Fractals of the Mists that occurs at levels 8, 29, 53 and 81.
Objectives[edit]
- Fractal Difficulty Scale: x
- Personal Fractal Level: x
Find a way to higher ground.
- Fractal Difficulty Scale: x
- Personal Fractal Level: x
(if mining lasers path) - Assemble a firing team, arm yourself with dredge mining lasers, and destroy the reinforced door.
- Reinforced Door
(if bombs path) - Coat yourself in concealing dust to avoid security turrets, and ferry bombs to the door.
- Bombs placed.: x/9
- Use the detonator to blow up the door.: x
(both paths) - Subdue dredge forces.
Rabsovich
(if dredge power suit) - Destroy the dredge power suit.
Dredge Power Suit
(if ice elemental) - Vanquish the rampaging ice elemental.
Rampaging Ice Elemental
: x/1
Push deeper into the dredge stronghold.
Rewards[edit]
- Primary article: Fractals of the Mists#Rewards
Walkthrough[edit]
General[edit]
- Take Powerful Potion of Dredge Slaying and Superior Sigil of Sorrow as the fractal is full of dredge enemies.
- The time is set to night permanently so Superior Sigil of the Night will work.
- Use Powerful Potion of Elemental Slaying and Superior Sigil of Elemental Slaying for Veteran Ice Elementals and Legendary Rampaging Ice Elemental.
- Portal skills or White Mantle Portal Device and group Swiftness will speed certain sections up as there is a lot of back and forth.
- Excluding Champion Rabsovich, Blinded can be used on the dredge in this fractal[1], unlike dredge in other areas of the game. Also, long lasting Protection and Regeneration can be stolen from some dredge.
First Room[edit]
There is a pressure plate at the end of the left side path leading up from the first raised platform as you walk in. Have one person run up and stand on it to open the first gate. The player doing this only needs to stand on the pressure plate long enough for at least one person to pass the gate, after which they can run back to rejoin the others. The plates will remain activated if the player on it is downed, but will deactivate once they are defeated.
Next, one person activates a second pressure plate on the upper right path that is just past the first gate. Teleports can be used to skip straight up to the plate. Again, the player only needs to stay on the plate long enough to let at least two other players through the second gate into the central caged room with the big drill.
Once inside the caged room, dredge will continuously spawn, so it's important to perform the rest of the procedure quickly. There are two plates in this room, one left and one right. When both plates are activated, the gate enclosing the Control Panel at the back will open, and the gate that led into the room will remain open, allowing the person on the right side plate from earlier to come down and enter the central room as well. While the Control Panel is accessible, it must be activated and allowed to run for about 20 seconds without interruption to unlock the gates to the next area. Long lasting stealth, such as from Shadow Refuge or Ash Legion Spy Kit, is useful for activating the Control Panel.
Dredge will spawn and try to attack the person using the Control Panel and the people on the pressure plates. If either of the plates are deactivated, the Control Panel gates will shut, interrupting the procedure. A common strategy for this is to allow the 4 party members who are not standing on the second plate to get inside the caged room and clear dredge around the room while ignoring the veterans. Then, have the two tankiest players stand on the plates on either side of the room, at this point the 5th party member can run into the chamber and begin channeling the Control Panel while the remaining 2 party members kite dredge away from them and the pressure plates.
With the Control Panel activated, the gate opens and the party can proceed up the ramps to higher ground, past a Mistlock Singularity into the now unlocked tunnelled area with more dredge.
Second Room[edit]
Defeat or stealth past the Veteran Dredge Mining Suit and accompanying dredge and head through the open reinforced door. Only one of two doors in this area will be open, leading either left or right into the next room. The room is determined at random each day.
- Mining Lasers path (left door)
Once players kill the dredge leading into this area they will quickly note the orange AoE circles that appear in waves along the large ramp leading up to the right. These AoE circles must be avoided as they cannot be disabled. As players enter this area, by the left wall is a Mining-Laser Rack that players need to interact with to equip special Dredge Mining-Lasers (sometimes referred to as "rifles" or "guns"). Upon picking up this bundle, players will lose all of their endurance and be unable to dodge.
Players carrying the Mining Lasers will need to advance up the large ramp being bombarded with orange AoE circles. If hit while carrying one, the first skill Dredge Mining Cannon will change to Weapon Malfunction and using it will cause the Mining Laser to explode, launching the player and removing the bundle. If this happens, the player needs to return to the Mining-Laser Rack and retrieve a new rifle. The easiest way to move up the large ramp is to hug the left or right walls- when the ramp levels out, there will be a pocket of safe area along the left wall. Players need only to wait for the waves of AoEs to move past them and then move out of this safe spot, continuing to the left and towards the large targetable Reinforced Door.
Targeting the Reinforced Door then activating Dredge Mining Cannon on the Mining Laser while in range of it will damage it for about 9%, leaving the door in a Weakened State. The Mining Laser will become overheated and the Dredge Mining Cannon skill will change to Weapon Malfunction, same as being hit by the AoE circles. At this point, dredge will spawn near the Reinforced Door that the party will need to kill. Repeat this process, returning to the Mining-Laser Rack to equip new ones, until the door is destroyed and the party can progress through to the next room.
Tips
- Note that upon picking up the Dredge Mining-Laser, your endurance and endurance regeneration reduce to 0, removing the ability to dodge as long as the laser is held. Attempting to work around that restriction through endurance generation skills will cause your gun to overheat or explode upon dodging. Teleports and blinks will also cause the Mining Laser to overheat or drop. This also applies to Daredevils, as while they are reduced to 50 Endurance rather than 0, attempting to dodge results in the Mining Laser being dropped.
- Having Swiftness is helpful here.
- You can jump up the blocks on the left and right sides using the small pixel wide ledges. This can be tricky unless you know the right spot, so for the first time, try finding it after the AoEs have stopped firing.
- Bombs path (right door)
Clear the dredge leading up to this area by grouping them up using line of sight behind the pipe on the left wall. As you enter this area, a platform on the right will have a patrolling Dredge Security Contractor with a permanent aura denoted by a red circle around it. On the right end of the platform will be a partially caged section with a pipe marked with that periodically dispenses 3 Bombs. Non-hostile dredge will spawn and walk over to collect the bombs; they do not need to be fought, players merely need to pick the bombs up as soon as they appear to prevent the dredge from collecting them. Upon picking up a bomb, leave the caged area without being detected by the Dredge Security Contractor, turn right and pass through the Cloud of Concealing Dust being released from one of the pipes to gain a long Stealth. Players who move into the Dredge Security Contractor's red aura will be Revealed.
Once stealthed, players move up the hallway in front of them. Several stationary Interloper Security Countermeasure turrets are located on either side of the hallway creating permanent detection zones marked with long red rectangular outlines on the ground. Players can pass safely through these zones as long as they have stealth, otherwise they will be Revealed and their bombs will explode, leaving them stunned. Once a player makes it up to the end up of the hallway, there will be a pipe marked with on the left wall to interact with and deposit bombs. 9 bombs in total are needed and the total number of bombs successfully deposited by the party will be shown in the objectives interface. There is a second Cloud of Concealing Dust located opposite the bomb depository pipe that players can use to stealth back to the start of the hallway to retrieve more bombs and repeat this process.
When a bomb is deposited, several dredge will spawn near the depository pipe, however they don't have to be dealt with as long as players remain in stealth. As more bombs are placed in the pipe, more Dredge Security Contractors will spawn throughout the hallway, including one that will patrol through the second Cloud of Concealing Dust at the end of the hallway. Players need to be careful of this one in particular because being revealed will cause the dredge at that end of the hallway to begin attacking any unstealthed players. The bombs have a 20s timer that begins upon pickup, shown via the Bomb Timer effect. The stealth lasts quite a while, but the player should be aware of how much time remains, as the bomb exploding will also Reveal them.
Once 9 bombs are placed in the depository pipe, players will be able to interact with the Conspicuous Detonator across from the pipe which will destroy the Reinforced Door blocking the end of the hallway. It is advised for parties to group up at the detonator before destroying the gate since the dredge that have appeared during bomb placements do not despawn at this point. Progress through the destroyed Reinforced Door to move to the next part of this fractal.
Tips
- Make sure to walk through both Clouds of Concealing Dust.
- Having perma Swiftness makes this a lot easier.
- If you know you won't have time to carry the Bomb because of how the dredge have moved, head back and drop it.
- You can jump on terrain to avoid some dredge, such as the hand-railings of the stairs.
Third Room[edit]
A champion dredge, Rabsovich, and a veteran dredge await you in this room for a mini-boss fight. This fight is fairly straightforward. He will be accompanied by a veteran dredge along with any dredge who your party pulled into this room from the previous phase, these can all be easily killed with AoEs/cleave during the fight with Rabsovich.
Rabsovich will periodically create an orange AoE rectangle leading out from his body in front of him. After a short delay, players in this AoE will take damage. He will also raise his shield throughout the fight and begin blocking all attacks while also dazing anyone who attacks him. During this time is a good chance for your party to take care of any mobs still alive around Rabsovich. He will continue to periodically spawn extra dredge from the dredge carrier, but these are easily cleaved out, as they spawn almost on top of him.
When Rabsovich dies, the dredge carrier will activate and drive through one of the walls. Continue through this broken wall to reach the next and final area.
Final boss[edit]
Final boss is either the Legendary Dredge Power Suit or the Legendary Rampaging Ice Elemental, with daily rotation.
Legendary Dredge Power Suit[edit]
The room is surrounded by a platform all the way around with buckets of molten ore and control panels for each on the platforms. The important mechanic for this boss fight is to use those controls to dump the buckets of molten ore onto the boss. Characters with shadowstep abilities may teleport up to the switch platforms, saving time and maintaining DPS. To do so, don't stand directly under the platform, but a little to one side, targeting the platform edge with the appropriate skill. Examples of shadowsteps include Thief's Infiltrator's Arrow, Mesmer's Blink, Elementalist's Lightning Flash, Necromancer's Necrotic Traversal, etc.
This boss has four basic attacks: an AoE stomp that does moderate damage, a standard physical 1-2 punch attack that does high damage, a large AoE attack where he pounds the ground sending up large dust clouds and doing moderate agony damage, and an AoE cluster bomb attack that does massive damage and can overlap, resulting in one-hit kills for even the most heavily armored characters. The bombs can be evaded while exploding by dodge rolling, though it's better just to move out of the blast radius.
The Dredge Power Suit also has a healing ability similar to a golem, where it plants itself in the ground, and the group must Interrupt the heal. If the boss is affected by the Superheated debuff from the buckets, this heal is interrupted by any damage done to the boss. If the boss is unaffected by the Superheated debuff then actual control effects need to be used. Condition damage is found to not affect him in the way it does normal mobs. At this point it is unknown whether this is intentional or a bug. [verification requested]
- General Strategy
A significant feature of this boss is its massive health pool which makes it effectively invulnerable. This is where the buckets of ore come into play.
Have one player, preferably the character that is the most mobile, to climb up to the platforms surrounding the room to operate the controls for the molten ore buckets. The boss will become Fixated upon a particular player. If it is the bucket pourer, make sure someone is ready to switch places. The fixated player should kite the boss underneath a bucket (denoted by dark scorch marks), where the player at the controls can dump the molten ore on it, giving it the Superheated debuff. The debuff lasts 30 seconds and significantly increases the damage the boss takes, allowing it to actually be damaged effectively. From here, you can follow one of two strategies.
1. Break his defiance bar while dropping the lava, and do as much melee damage as you can, moving him once his debuff is at around ~5-10s remaining. The bucket pourer may generally drop down and help damage him. This method is extremely fast, and carries the risk of getting hit by melee attacks once the stun wears off.
2. (for groups with low melee damage or those with low crowd control skills) Continue kiting him from bucket to bucket, dealing consistent ranged damage. This method is much slower, but extremely safe, as it always ensures you have plenty of room to dodge his attacks and avoids his heavy hitting melee attacks. Not being able to stun him runs the risk of missing a bucket, however.
Using either method, take care not to take too long between lava pulls, as the self-heal easily heals 25%. Be sure to have all members kiting the mob stacked together and pulling in the same direction so if the Power Suit switches fixations on one character, he is still being pulled in the correct direction. This can create problems with evasion but is essential to quickly downing the boss. It is important to assign a secondary bucket activator in the case that the primary person goes down or becomes fixated.
When choosing a kiting path, the team can either go back and forth between two buckets, or kite around the room in a circular pattern. The back-and-forth path is easier on the person running the controls, as the distance is shorter, however the circular pattern is safer if a member of the team goes down, as they have longer to be revived.
Tips:
- When fighting the Power Suit reflection skills can protect from the bombs and bounce them back at the boss, however the reflected bombs deal no damage to the Power Suit.
- Thieves, mesmers, and elementalists can shadowstep/blink/lightning flash up to most of the bucket platforms from the ground, enabling faster pulls and movement.
- Bringing Crowd Control skills is recommended, as the additional debuff applied once his defiance bar is broken, in addition to his stun makes this a far safer and faster fight. It can also help the group position him if he is broken directly under the lava bucket. Be careful not to break him between buckets, as the extra time taken may allow him to get his heal off.
Legendary Rampaging Ice Elemental[edit]
This fight uses the same molten ore bucket mechanic as the Legendary Dredge Power Suit, and the effects of its attacks are similar. There are, however, two major differences.
First, while the Dredge Power Suit's cluster bomb attack fires in a fixed pattern around it, the Ice Elemental's Ice Shards directly target the players attacking it. Second, in addition to the Legendary Rampaging Ice Elemental itself, a number of Veteran Ice Elementals spawn and respawn during the fight, adding more danger to the fight. While these Veteran Ice Elementals will respawn infinitely, their spawn rate is slow enough that it can still be helpful to kill them, to reduce the number of threats on the field and make it easier to concentrate on the Legendary Elemental itself. They are also affected by the lava and take extra damage while overheated.
The Ice Elemental will occasionally visibly kneel and start healing the damage he has taken. The group should interrupt the heal by using a stun or knockdown skill on him, even if he is otherwise immune to the interrupting effect. This should be a priority for the group, since any healed damage will need to be re-inflicted, prolonging the fight. As with the Power Suit boss, Ice Elemental's self-healing will be interrupted by simply damaging them if they are affected by the Superheated debuff at the time.
Achievements[edit]
Underground Facility Fractal Stabilizer | Fractals of the Mists | 5 |
---|---|---|
You've completed the Underground Facility fractal inside the Fractals of the Mists.Rabsovich's worst nightmare. | 1 Fractal | 5 |
Master of the Molten Ore | Fractals of the Mists | 5 |
---|---|---|
Only use four buckets during the boss encounter of the Underground Facility fractal. | Defeated the Boss of the Underground Facility Fractal While Only Using Four Buckets | 5 |
Stealth Bombers | Fractals of the Mists | 5 |
---|---|---|
Use stealth to bomb the reinforced door without triggering any security turrets or contractors within the Underground Facility fractal. | Destroyed the Reinforced Door Without Alerting the Locals | 5 |
Carrier Cacophony | Fractals of the Mists | 1 | 5
---|---|---|
You made it through Rabsovich's onslaught without dying while inside the Fractals of the Mists.Not part of Rabsovich's plan. | 1 Challenge | 5 |
NPCs[edit]
Foes[edit]
- Champion Rabsovich
- Dredge Bomber
- Dredge Disaggregator
- Dredge Excavator
- Dredge Oscillator
- Dredge Ratnik
- Dredge Resonator
- Dredge Reverberant
- Dredge Security Contractor
- Legendary Dredge Power Suit
- Veteran Dredge Bomber
- Veteran Dredge Disaggregator
- Veteran Dredge Excavator
- Veteran Dredge Mining Suit
- Veteran Dredge Strazar
Objects[edit]
- Bomb
- Cloud of Concealing Dust
- Conspicuous Detonator
- Control Panel
- Dredge Mining Turret
- Interloper Security Countermeasure
- Mining-Laser Rack
- Reinforced Door
Dialogue[edit]
- Entering the fractal
- Dessa: Can you (static burst) Hello? The signal (static burst) interferences (static burst) higher ground. But (static burst) are everywhere (static burst) hear me? Higher. Ground.
- Fighting the dredge champion
- Champion Rabsovich: To battle!
- Fighting the Legendary Dredge Power Suit
- Legendary Dredge Power Suit: Now you die!
- Legendary Dredge Power Suit: Fear the collective!
- After defeating the final boss
- Dessa: There! Finally, a solid signal. Everything looks stable, too. You can depart when you're ready. So, did I miss anything?
Related achievements[edit]
Upon completion[edit]
- The Dreamer I: The Experimental Short Bow: Love of Revolution — Found in the chest in the Underground Facility Fractal.
- The Minstrel III: The Bard: Song of the Moletariate — Collect the sheet music for the Song of the Moletariate from the Underground Facility Fractal chest.
- Nevermore IV: The Raven Spirit: Ancient Dwarven Texts — Found in the Underground Facility Fractal chest.
- Legendary Backpack: Ad Infinitum: Underground Facility Challenge Mote
Objective during[edit]
- Frostfang III: Tooth of Frostfang: Underground Facility Ice Shavings
- Incinerator III: Spark: Smouldering Concoction — Use the cold environment found in the Underground Facility Fractal to safely react Flame Jelly with Caustic Paste at the ice pillar to form a Smouldering Concoction.
- Sunrise III: Dawn: Frosty Glow — Use the Illuminator to capture the light of the glowing ice pillar in Underground Facility Fractal.
- Twilight III: Dusk: Underground Darkness — Use the Gloominator to capture the darkness in Rabsovich's room in the Underground Facility Fractal.
- Ad Infinitum III: Unbound: Rabsovich's Lost Treasure
Trivia[edit]
- Which path you had to take (bombs or guns) used to depend on the fractal level, but after the rework the paths are randomly selected every time the instance is opened.
- Until the 26th June 2018 update, damaging the Reinforced Door required three party members to use their mining lasers at the same time, with the objectives displaying "Firing-team members present at door: x/3".
References[edit]
- ^ 21st November 2016 update notes: The dredge in the Underground Facility have opened their eyes and can now be blinded.