The Blast Furnace is one of the more complex raid encounters in World of Warcraft: Warlords of Draenor. It is the ninth boss fight in the Blackrock Foundry raid, located in the Slagworks wing. Unlike most bosses, you don’t simply pull the boss to begin the fight.
Instead, the event is activated in a specific way that many players overlook, which can lead to confusion when trying to start the encounter. If you’ve ever wondered how to activate the Blast Furnace in WoW, this guide will walk you through the exact steps.
Locating the Blast Furnace
To reach the Blast Furnace, you’ll need to head into the Slagworks section of Blackrock Foundry. Once inside, you’ll enter a large chamber dominated by the massive Blast Furnace itself, with mobs scattered around the room. The fight is a multi-phase encounter against waves of adds, overseen by the Heat Regulators and eventually Foreman Feldspar.
Many players enter this room and expect the fight to start automatically, but the Blast Furnace has to be triggered in a specific way.
How to Start the Blast Furnace Encounter
To activate the Blast Furnace fight, your raid must interact with the Heat Regulators on either side of the massive furnace in the center of the room. Here’s what to do:
- Clear the surrounding trash mobs before attempting to start the fight. These consist of Slagged Elementals, Security Guards, and Firecallers, which can overwhelm you if left unchecked.
- Assign players to collect bombs dropped by the Grom’kar Firecallers. These bombs are the key mechanic for starting the fight.
- Use the bombs on the Heat Regulators. Each Heat Regulator requires multiple bombs to destroy. Once both Heat Regulators are destroyed, the Blast Furnace fight will officially begin.
This is the crucial step that confuses many players. If no one is using the bombs on the Heat Regulators, the fight won’t start, and it can feel like the encounter is bugged.
How to Start the Blast Furnace Encounter if You Solo It
Many players now enter Blackrock Foundry solo for transmog or achievements. The Blast Furnace can be confusing when you’re alone, since you don’t have other players to help with bombs. Fortunately, the encounter can still be started:
- Clear the room yourself to avoid being overwhelmed when you focus on bombs.
- Kill Firecallers until bombs drop. As a solo player, you’ll need to pick these up manually.
- Carry the bombs to the Heat Regulators. You may need to kite or kill additional adds while doing this, but most modern characters can handle it easily.
- Repeat until both Heat Regulators are destroyed. Once they’re down, the fight will trigger even if you are solo.
If you’re struggling to juggle the adds and bombs at the same time, focus on keeping the area clear first. At current expansion levels, most classes can easily wipe the room before starting on the Regulators. After that, it’s just a matter of picking up a few bombs to set the encounter in motion.
Why the Encounter Might Not Start
Sometimes players run into the issue where it seems like the Blast Furnace is not starting. This usually happens for one of a few reasons:
- Trash mobs not cleared: The encounter won’t begin properly if enemies in the room are still alive.
- No bombs used on the Heat Regulators: The fight does not trigger by attacking NPCs directly. Only the destruction of the Heat Regulators activates the event.
- Bombs not picked up quickly: Bombs despawn if not used quickly, so if your raid misses several bombs in a row, progress toward destroying the Heat Regulators will stall.
If the encounter feels stuck, double-check that bombs are being collected and used properly.
Resetting the Encounter
In some cases, you might run into bugs or simply fail the setup. If that happens:
- Have the raid wipe to reset the room.
- Exit the instance and use the Reset All Instances option if needed.
- Once reset, re-clear the room and start again with fresh bombs.
This usually fixes any problems with the encounter not starting.
Tips for a Smooth Start
- Assign at least one dedicated player to pick up bombs and run them to the Heat Regulators.
- Clear the room fully before starting to avoid unnecessary chaos.
- Communicate clearly so bombs aren’t wasted or missed.
Once the Heat Regulators are destroyed, Phase 1 begins, and the real fight is underway. The Blast Furnace is all about coordination, and getting the encounter started correctly is the first test of your raid’s teamwork.