Steel Watch Foundry BG3 Walkthrough: Destroy, Save, and Survive

Deciding whether to storm the Steel Watch Foundry or rescue the Iron Throne prisoners first in Baldur’s Gate 3 Act 3 isn’t optional flavor — it determines whether the Gondians revolt to make your fight easier or stay enslaved, making the final encounter harder. This guide walks through every method to destroy the foundry, the optimal order of operations, and how to save the Gondians without losing progress.

Foundry location: Lower City, Grey Harbor Docks, Act 3 ·
Floors: 3 (Entrance, Factory Floor, Control Center) ·
Key NPC faction: Gondians (captives) ·
Difficulty range: Level 9-12 ·
Steel Watcher types inside: Regular, Titan, Submerged ·
Destruction methods: Bomb, Toobin, Direct combat

How do you destroy the steel watch foundry in BG3?

The quest “Disable the Steel Watch” comes from the Ironhand Gnomes in the Lower City. Three destruction methods exist, each with different requirements and risk profiles.

Enter the foundry

• Front gates: DC 20 Sleight of Hand check, or Thieves’ Tools, or Knock spell (bg3.wiki community wiki)
• Vent entrance: alternative route through a maintenance vent on the west side
• Roof hatch: fly or climb onto the roof and drop through the open hatch (The Escapist gaming publication)

Once inside, head to the Security Office on the east side and speak with Zanner Toobin (TheGamer gaming guide). He explains the Gondian situation and offers to disable the system if you free his people.

Plant the bomb or use Toobin

Two primary destruction methods, one clear winner for most parties:

• Runepowder Bomb: Given by Wulbren Bongle after you agree to help the Ironhands. Place it at the control panel next to the Neurocitor in the Control Center (TheGamer gaming guide).
• Toobin’s method (GC-MB-01): Escort Zanner Toobin to the Control Center. He uses his gauntlet to disable the Steel Watch army from within (VG247 gaming news).
• Direct combat: Kill every Steel Watcher in the Foundry. The Titan and all patrols must fall. No explosion, just attrition.

Fight the Steel Watcher Titan

The boss encounter on the Factory Floor involves a Steel Watcher Titan with 270 HP. It uses area attacks and summons reinforcements. Disable every Motivator that appears during the fight to prevent buffs (Upcomer gaming guide).

Escape or clear the facility

After detonation, you have 4 turns to reach the exit before the building collapses. Dimension Door, Misty Step, or a Hasted character can cover the distance easily. Clear remaining enemies only if you need loot — otherwise, prioritize escape.

The catch: Bombing the Foundry without freeing the Iron Throne hostages means the Gondians inside die. You lose their allegiance and the allies they provide in the final battle.

Should I destroy the brain jars in the steel watch foundry?

Brain jars are a recurring point of confusion. Here’s what they actually do.

Where are the brain jars?

Brain jars line the walls of the Control Center on the third floor of the Foundry. They’re visually distinct — floating cylindrical containers with neural tissue inside.

What happens when you destroy them?

Destroying the brain jars frees the Gondian prisoners held in the Iron Throne (bg3.wiki community wiki). Without this action, the prisoners remain enslaved and cannot be rescued during the Iron Throne sequence.

Impact on Gondian survival

Freeing the brain jars doesn’t affect the Foundry destruction itself. It does, however, unlock the “Save the Gondians” quest path and ensures the Gondians can become allies for the final confrontation (EIP Gaming strategy guide).

The implication: Destroying brain jars is a prerequisite for the Gondian ally path, not a direct Foundry mechanic.

Should you do steel watch foundry or iron throne first?

This is the single most consequential ordering decision in Act 3. The choice changes dialogue, enemy placement, and which allies survive.

Three sequences, one pattern: the order determines your relationship with Gortash and the Gondians.

Advantages of Foundry first

• Disables Steel Watcher patrols in Lower City immediately (EIP Gaming strategy guide)
• Prevents Gortash from using Steel Watchers during his coronation
• Simpler path if you lack the levels for the timed Iron Throne

Advantages of Iron Throne first

• Gondians in Foundry revolt, turning the fight against Steel Watchers (Neoseeker walkthrough site)
• Saves all thirteen Gondian hostages for ally recruitment
• Unlocks unique dialogue with Zanner Toobin

Recommended order based on party composition

For most parties: Iron Throne first. The difficulty spike is front-loaded — you face a timed escape with limited resources — but the Foundry becomes dramatically easier afterward. For honor mode runs where survival matters more, Foundry first reduces patrols and lets you tackle the Iron Throne without the pressure of simultaneous Steel Watcher aggression.

The trade-off: Iron Throne first makes Gortash hostile. You lose the ability to trade with him, assassinate him at the coronation, or complete his personal quest. If you want any of those outcomes, Foundry first is the only clean path.

What level should you be for steel watch foundry bg3?

Level recommendations vary by difficulty and party composition. Here’s the breakdown.

Minimum level for a fair fight

Level 9 is the practical minimum. At this level you have access to third-level spells (Fireball, Haste, Counterspell) and enough HP to survive a Steel Watcher’s explosive attack (EIP Gaming strategy guide).

Recommended level for most parties

Level 10-11 is recommended for most parties. You get fourth-level spells (Polymorph, Wall of Fire) and a significant HP buffer. The Steel Watcher Titan has 270 HP and multiple attacks — you need sustained damage output across 3-4 rounds.

Best spells and abilities for the Foundry

• Lightning damage: Steel Watchers are vulnerable to lightning. Call Lightning, Lightning Bolt, or Chromatic Orb deal bonus damage.
• Counterspell: The Titan’s area attacks can be interrupted.
• Dimension Door / Misty Step: Critical for escape after detonation.
• Healing Word / Mass Healing Word: Gondian NPCs have low HP and die easily.

The pattern: Higher levels let you survive the Titan’s burst damage, but smart spell selection matters more than raw XP.

Should I do steel watch or Orin first?

Orin’s quest line runs parallel to the Foundry. They don’t interact directly, but resource allocation matters.

Quest dependencies

Orin does not directly affect the Foundry (Neoseeker walkthrough site). Her target is a companion — killing her doesn’t change Gortash’s behavior or Foundry mechanics.

Impact on Gortash alliance

Doing the Foundry first can prevent Gortash’s coronation rewards. If you accept his alliance, you get a permanent speed buff and access to certain vendors. Destroying the Foundry voids that deal.

Loot and reward comparison

Orin drops the Netherstone and some of the best endgame gear (Crimson Mischief, the Shapeshifter’s Boon Ring). The Foundry yields the Steel Watch disable and Gondian allies. Neither invalidates the other — but Orin’s fight is solo-able, while the Foundry requires your whole party.

What this means: Orin and the Foundry are independent; do whichever suits your party’s power curve first.

Can you leave the steel watch foundry to long rest?

Short answer: no, not cleanly.

Is the area instanced?

The Foundry is a non-leavable dungeon once entered. The game treats it as a single-instance map — leaving triggers a checkpoint save, but the dungeon state resets partially (TheGamer gaming guide).

Do enemies respawn?

Leaving the Foundry resets some traps and patrols. Gondian NPCs that died during your run stay dead. Enemies on the Factory Floor respawn in their original positions.

Risk of Gondian deaths during rest

Long resting inside the Foundry is not possible — you must leave. If you leave mid-run, the Gondians you haven’t freed remain captive, and some die during your absence. The game warns you before you exit: “Leaving will allow the Steel Watchers to execute the remaining Gondians.”

What this means: Plan your Foundry run as a single-session activity. Stock potions, spells, and scrolls before entering. If you need to leave, accept the Gondian casualties and move on.

Is saving the Gondians worth it?

Yes — but the cost in difficulty is real.

Rewards for saving them

Saved Gondians provide allies for the final battle — a Gondian squad that can distract enemies and soak damage. They reward a unique helmet (Helmet of the Gondian Defender) and access to the Iron Throne for the submersible escape (bg3.wiki community wiki).

Difficulty of saving all Gondians

The Gondians have very low HP (around 30 each) and no self-preservation AI. They rush into melee and die to Steel Watcher area attacks. Saving all thirteen requires careful positioning, Sanctuary, and crowd control spells.

Impact on ending slides

Failing to save them results in stronger Steel Watchers in the final battle and a darker ending slide where the Gondian civilization collapses without its smiths and engineers (TheGamer gaming guide).

The implication: Saving the Gondians is mechanically demanding but narratively rewarding. Weigh the difficulty against the story payoff.

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Frequently asked questions

For players deciding between Foundry and Iron Throne first, the implication is clear: Iron Throne first makes the Foundry easier but costs Gortash’s alliance. Foundry first is simpler but loses the Gondian revolt. Choose based on whether you want a cleaner Act 3 (Iron Throne first) or complete control over Gortash’s fate (Foundry first).