Siegecrafter Blackfuse (originally named "Helix Blackfuse") is the twelfth boss of Siege of Orgrimmar and a traitor even for Goblin standards.


Dungeon Journal

Helix Blackfuse was the only goblin with the combination of engineering prowess, professionalism and ruthlessness to satisfy Garrosh in his search for the engineer of the True Horde. His love for his creations (and for the gold they fetch) blinds him to the fate that his fellow goblins are likely to face should Garrosh's plans come to fruition.

Encounter Design

Alongside the hardened infantry who are preparing for war in Garrosh’s underground barracks, Garrosh’s army would need mighty siege engines. The foundation for the concept of this fight lies in the U-shaped conveyor belt that encircles the chamber, allowing players to jump up into the workings of the assembly line and disrupt the manufacturing process. Observant players may recognize the components being assembled as the various parts of the Iron Juggernaut that they defeated earlier, with an extra heaping dose of bombs—because if you’re a goblin, there’s no such thing as too many bombs.[1]


Siegecrafter Blackfuse

  • Inv misc sawblade 01  [Launch Sawblade]—Siegecrafter Blackfuse launches a magnetized sawblade at a random player. The sawblade will hover in place until it is removed by an Activated Electromagnet.
    • Inv misc sawblade 01  [Serrated Slash]—Sawblades inflict 500,000 Physical damage to any players or Automated Shredders with which they come into contact, knocking back any affected players.
  • Spell shadow unholyfrenzy  [Protective Frenzy]—When one of his creations is destroyed, Siegecrafter Blackfuse enters a frenzy, increasing his attack speed by 100% and damage done by 50% for 10 sec.
  • Spell shaman staticshock  [Electrostatic Charge]—Siegecrafter Blackfuse charges his target with static electricity, inflicting 250,000 Nature damage. Electrostatic Charge also leaves a lingering effect increasing the damage taken from Electrostatic Charge by 100% increasing damage dealt to targets with Reactive Armor by 1,000%. This effect stacks up to 10 times.
  • Ability siege engineer automatic repair beam  [Automatic Repair Beam]—Siegecrafter Blackfuse's suit is fitted with an Automatic Repair Beam, which will detect any damaged Automated Shredders within 35 yards, and heal them for 5% of their maximum health every 3 sec.
  • Spell arcane arcane02  [Overcharge]—When activated weapons arrive on the assembly line, Siegecrafter Blackfuse will Overcharge one of them, increasing its power and effectiveness.
  • Ability vehicle shellshieldgenerator  [Energized Defensive Matrix]—If three weapons make it through the Assembly Line and into Blackfuse's assembly machine, the machine will become overcharged and use the excess energy to power the defensive systems on Blackfuse's suit, granting him 90% reduced damage for 20 sec.
  • [Automated Shredders]—Siegecrafter Blackfuse will periodically call in Automated Shredders to join the fight.
    • Inv misc armorkit 27  [Reactive Armor]—Automated Shredders have been retrofitted with Reactive Armor, reducing damage taken by 90%. Automated Shredders can also be damaged by Serrated Slash, Shockwave Missile, Detonate! and Superheated.
    • Ability kilruk reave  [Death from Above]—The Automated Shredder propels itself into the air and then slams back into the ground, dealing 475,000 damage to players within 15 yards of the point of impact. After landing, the Shredder is stunned and takes 300% additional damage for 5 sec.
    • Ability siege engineer overload  [Overload]—The Automated Shredder will periodically cast Overload, dealing 200,000 damage to raid members not currently on the conveyor belt, and increasing its damage dealt by 10%.
  • [The Assembly Line]—Periodically, Siegecrafter Blackfuse will initiate fabrication of a set of weapons on the assembly line in his workshop. Disassembled weapons are brought in via conveyor belts along the northwest side of his room. They then pass through an assembly machine on the northeast wall of his room. Finally, they emerge completed on conveyor belts along the southeast wall of his room, where they attack players. Players can use Transport Pipes to reach the conveyor belt along the northwest side of his room, where they can attack and destroy the disassembled weapons. After players destroy a weapon, the remaining weapons become shielded and cannot be damaged.
    • [Transport Pipes]—Transport Pipes line the western edge of Siegecrafter Blackfuse's workshop. Players can jump into these pipes to reach the conveyor belt along the northwest side of the workshop.
      • Ability siege engineer pattern recognition  [Pattern Recognition]—After using the transport pipes to reach the conveyor belt, the assembly line recognizes a player's biological signature and will reject further attempts to use them for 60 sec.
      • Ability siege engineer purification beam  [Matter Purification Beam]—Matter Purification Beams line the platform, inflicting 9,999,999 Fire damage to any players that come into contact with them.

Shockwave Missile Turret

  • Ability siege engineer sockwave missile  [Shockwave Missile]—The Shockwave Missile turret launches a drill-tipped Shockwave Missile into the ground, sending a barrage of drills that ripple out from the impact location and create rings of seismic energy. Each ring of seismic energy inflicts 385,000 Nature damage to all players caught within it.
  • [Overcharged Missile Turret]—When Overcharged, the Shockwave Missile Turret will fire Shockwave Missiles which persist and continuously barrage the platform with drills and seismic energy until destroyed by players.
  • [Laser Turret]—When activated, Siegecrafter Blackfuse's Laser Turrets fire a beam of energy that tracks a player, leaving behind patches of superheated ground for 60 sec.
  • Ability siege engineer superheated  [Superheated]—The ground hit by a Laser Turret's beam burns any players or Automated Shredders who step on it, inflicting 75,000 Fire damage each second for 10 sec. This effect stacks every second that a player or Automated Shredded remains on superheated ground, and can stack up to 50 times.
  • [Overcharged Laser Turret]—When Overcharged, Siegecrafter Blackfuse's laser turrets will fire a split beam, creating three concentric arcs of Superheated ground.


  • Ability siege engineer magnetic crush  [Magnetic Crush]—When activated, the electromagnet will begin to magnetically crush all players on the platform, inflicting 75,000 Physical damage each second and pulling them towards the electromagnet. The force of the electromagnet will also pull all sawblades on the platform towards it and off the platform, causing them to damage any enemies or Automated Shredders in the path of the blades.
  • [Overcharged Electromagnet]—When Overcharged, the Electromagnet will periodically reverse polarities, pushing both players and sawblades in and out from the magnet.
  • [Crawler Mine]—Assembled Crawler Mines leap down from the conveyor belt, fixating on a random player.
    • Ability siege engineer detonate  [Detonate!]—When a Crawler Mine reaches its target, or after a Major Malfunction, it will self-destruct, inflicting 275,000 Fire damage to players within 300 yards and knocking them into the air.
    • Petbattle speed-down  [Break-in Period]—Crawler mines are vulnerable to roots, snares and stuns for 60 sec after joining the battle.
    • Petbattle speed  [Ready to Go!]—After their Break-in Period expires, Crawler Mines lose their vulnerability to stuns, roots and snares, and their speed increases.
    • [Overcharged Crawler Mines]—When Overcharged, Crawler Mines activate a construction matrix within their machinery. This construction matrix enables them to create two new Crawler Mines when they are destroyed.


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Horde 15 Grizzle Gearslip and a contingency of goblin troops teleport into the Siegeworks.

Grizzle Gearslip says: So Garrosh thinks he can cheat ol' Grizzle out of a payday, huh?!

Grizzle, his troops and the raid notice Siegecrafter Blackfuse adding the finishing touches to an immense, spherical weapon.

Grizzle Gearslip says: Oh, ho ho... What do we have here?

Alliance 15 Moira Thaurissan and a contingency of dwarven troops drill into the Siegeworks.

Moira Thaurissan says: Oi! That was a fun ride!
Moira Thaurissan says: Heroes, I salute you. There's something right foul in these chambers below the city.
Siegecrafter Blackfuse says: Oh, look. You're the ones who smashed up my Juggernaut.
Siegecrafter Blackfuse says: Let's see how you like the newest addition to the Warchief's arsenal... the Iron Star!
Horde 15Grizzle Gearslip says: Go get it boys, that contraption's got nothin' on real goblin engineering!
Alliance 15Moira Thaurissan says: Ooh, that looks dangerous. Get in there, boys, and show em' what we're made of.

Grizzle's/Moira's troops charge the Iron Star. The Star rolls forward, spewing flames in its path before exploding. Grizzle's/Moira's troops are slain instantly.

Siegecrafter Blackfuse says: Hehehehahahaha!
Horde 15Grizzle Gearslip says: Ahhhh! Or maybe it does. I better, um, go check on the others.
Alliance 15Moira Thaurissan says: A right deadly machine, that is. Best watch yer step down here, heroes.

Blackfuse flees through the pipes into his workshop, where he climbs into his Shredder.

Siegecrafter Blackfuse says: Aggron! Show 'em who's boss!
Siegecrafter Blackfuse yells: Goro'dan! You're on deck!
Siegecrafter Blackfuse yells: All right, Shanna. You're up.
Siegecrafter Blackfuse yells: Looks like I'm in the market for a new assistant.
  • Siegecrafter Blackfuse yells: Let's settle this.
  • Siegecrafter Blackfuse yells: Time to mix business with pleasure.
The Assembly Line
  • Siegecrafter Blackfuse yells: Start the assembly line!
  • Siegecrafter Blackfuse yells: Another round!
  • Siegecrafter Blackfuse yells: More, MORE!!
Automated Shredder
Siegecrafter Blackfuse yells: The SD-5 Automated Shredder defense unit. A labor of love.
Shockwave Missile Turret
Siegecrafter Blackfuse yells: Presenting... the beautiful new ST-03 Shockwave missile turret!
Laser Turret
Siegecrafter Blackfuse yells: Meet the LT-403 Evaporation laser. A personal point of pride.
Siegecrafter Blackfuse yells: Ya' ever wonder how magnets work?
Crawler Mine
  • Siegecrafter Blackfuse yells: What's better than a bomb, huh?! I'll tell ya - a bomb with two bombs inside!
  • Siegecrafter Blackfuse yells: Hey, I heard you like mines, so... enjoy!
Weapon destroyed
  • Siegecrafter Blackfuse yells: Hey! You're gonna pay for that!
  • Siegecrafter Blackfuse yells: You son of a...
Killing a player
  • Siegecrafter Blackfuse yells: Another satisfied customer.
  • Siegecrafter Blackfuse yells: That's for the Juggernaut.
Siegecrafter Blackfuse says: Don't... think you've won...
Siegecrafter Blackfuse says: My legacy... will live on...

Patches and hotfixes

  • WoW Icon 16x16 Hotfix (2013-10-03): "Demonic Circles are now cleared when the encounter starts."
  • WoW Icon 16x16 Hotfix (2013-10-02): "
    • Players are now immune to Superheated while being pulled off the conveyer belt.
    • Shockwave Missile no longer hits players that are exiting a transport pipe."
  • WoW Icon 16x16 Hotfix (2013-09-23): "Automatic Repair Beam should now always be properly applied to Automated Shredders when they get near Siegecrafter Blackfuse."
  • WoW Icon 16x16 Hotfix (2013-09-19): "Siegecrafter Blackfuse will no longer Overcharge more than one cluster of Crawler Mines per wave on Heroic difficulty."
  • WoW Icon 16x16 Hotfix (2013-09-12): "Players standing on the conveyor belt should now be able to see Shockwave Missile and its damage effect regardless of the Shockwave Missile's position in the room."
  • Mists-Logo-Small Patch 5.4.0 (10-Sep-2013): Added.


  • Blackfuse is the first goblin raid boss.



Blackfuse 25 Heroic, Mage, Game Sounds, Boss voices, Vent, Post-Hotfix


External links

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