Iron Throne in BG3: A Race Against Death Under the Sea

There’s a moment in Act 3 of Baldur’s Gate 3 where the game just decides you’ve had it too easy. You’re getting somewhere, feeling confident – and then the Iron Throne shows up. Suddenly, you’ve got nine turns to rescue a bunch of prisoners trapped in an underwater jail while the whole thing collapses around you. No pressure.

It’s one of the most genuinely stressful sequences in any RPG in recent memory. Not because it’s hard in a stat-check kind of way, but because the clock is always ticking and every decision feels like it costs something. Miss a prisoner? Someone dies. Use the wrong ability at the wrong time? You’re probably reloading. It’s the kind of mission that makes you close your laptop, take a walk, and come back twenty minutes later.

Where Is the Iron Throne, and How Do You Even Get There?

The Iron Throne is an underwater prison sitting deep below Baldur’s Gate harbor. You won’t stumble across it accidentally – it’s tied directly to the story of Gortash and the Duke, and you access it through the Flymm Cargo building in the Lower City.

Inside Flymm Cargo, you’ll find a submersible. That’s your ticket down. Once you’re aboard and diving, the whole thing shifts – the atmosphere gets heavier, the lighting dims, and the game quietly signals that you’re now somewhere genuinely dangerous.

The prison itself is a series of flooded corridors and holding cells. It’s grimy, oppressive, and clearly not built with the prisoners’ comfort in mind. Which, honestly, fits perfectly with everything you already know about how Gortash operates.

Key navigation points inside the Iron Throne:

• The main dock area where you arrive and will need to escape from.
• The central corridor that branches into individual cell wings.
• The area where the Duke – or whoever you’re prioritizing – is held.
• A Sahuagin patrol zone that can complicate movement if you’re not careful.

The Sahuagin (those shark-people you’ve probably bumped into elsewhere) patrol the facility. You can sneak past them, fight them, or try to distract them – but every second you spend dealing with them is a second you’re not spending on prisoners.

The Nine-Turn Clock: Why This Mission Feels Different

Most of BG3 lets you breathe. You can explore, look around corners, check every container three times. The iron throne in BG3 takes all of that and throws it in the water – literally.

The moment you trigger the mission, a countdown starts. Nine turns. That’s it. After that, the prison implodes and anyone still inside (prisoners and party members alike) dies. There are no extensions, no clever workarounds, and no negotiating with the timer.

This fundamentally changes how you play. Normally in BG3, you might spend a turn positioning, thinking about buff spells, checking spell slots. Here, every action has to count. Movement is precious. Long-range teleportation abilities suddenly become incredibly useful. Misty Step, Dimension Door, Fly – anything that lets you cover ground without burning a full movement action is worth its weight in gold.

The turn structure also means you can split your party effectively. Send two characters toward one wing of the prison, two toward another. Each character’s turn counts separately, so a well-split party can cover twice the ground in the same number of rounds. It sounds obvious when you write it out, but in the heat of the moment, with alarms blaring and Sahuagin closing in, it’s easy to forget.

Who Can You Actually Rescue from the Iron Throne?

This is where the mission gets emotionally complicated, because it’s not just about abstract strangers. Some of these prisoners actually matter to your story.

Prisoner	Location in Prison	Story Significance
Ulder Ravengard	Eastern wing, far cell	Duke of Baldur’s Gate, Wyll’s father
Omeluum	Central area, mid-section	Illithid ally from the Underdark
Stonemasons	Scattered across west wing	Optional, tied to side content
Gondian gnomes	Multiple cells throughout	Critical to the Steel Watch questline

Ulder Ravengard is probably the one most players prioritize, especially if they’ve been running Wyll in their party. Saving him has real consequences – he gives testimony that affects the post-game political situation in Baldur’s Gate, and the moment where Wyll reunites with his father is genuinely touching if you’ve been paying attention to that storyline.

Omeluum is easy to miss if you’re not watching for him. He’s tucked away in the central section and doesn’t have a giant “rescue me” marker. If you helped him back in Act 1 in the Underdark, getting him out feels like closing a proper loop. He’s one of the more interesting NPCs in the game – a mind flayer who resisted the Elder Brain’s control – and leaving him to drown in an underwater prison is a rough way to end that arc.

The Gondian gnomes are tied to a longer questline involving the Steel Watch foundry and Gortash’s automaton army. Rescuing them feeds into dismantling that whole operation. If you’ve been doing that quest properly, you’ll want to prioritize them heavily.

Building Your Party for the Iron Throne

This is genuinely one of those missions where party composition matters more than usual. Rushing in with four melee fighters who rely on heavy armor is going to be a nightmare. The prison’s narrow corridors and the turn limit reward mobility above almost everything else.

What you actually want:

• High mobility characters – anyone with Misty Step, Fly, or Dimension Door should be front and center.
• Ranged attackers – to deal with Sahuagin without spending movement getting close.
• A cleric or healer – because prisoners you’ve freed can get hit while moving to the exit, and keeping them alive matters.
• Someone with good Perception – hidden triggers and locked cells can slow you down without warning.

What you should probably leave at home:

• Characters with slow movement speeds and no mobility spells.
• Builds that depend on concentration spells you can’t maintain while dashing around.
• Summons that clog corridors (they move on your turn and eat precious time).

If you’ve got access to the Haste spell, this is a great mission to use it. The bonus action movement it grants is legitimately game-changing here. Just watch for the Lethargy condition at the end – losing a turn right when you’re trying to sprint to the exit is painful.

Iron Throne in BG3: Turn-by-Turn Strategy That Actually Works

Okay, let’s get specific. Here’s a rough framework for getting through this without losing anyone important.

Turns 1-3: Split immediately. Don’t cluster your party at the entrance. Send your highest-mobility characters toward the wings where the most important prisoners are. Identify the Sahuagin patrol routes on turn one and plan around them. If you can sneak past, great. If not, burn them down fast.

Turns 4-6: Free the priority prisoners first. Get to Ravengard and Omeluum before going for anyone else. Once a prisoner is freed, they’ll start moving toward the exit on their own – but they move slowly and can get targeted. If you have a character nearby who can protect them or buff their movement, do it.

Turns 7-8: Sweep for stragglers. If you’ve been efficient, you’ll have a turn or two here to grab the Gondian gnomes and any other prisoners you flagged. If you’re running behind, hard decisions happen here. Prioritize by story impact and proximity.

Turn 9: Run. Everyone who isn’t already at the exit needs to be moving now. If a prisoner is across the prison and there’s no way to get them out, it’s a loss you’ll have to accept. Don’t sacrifice a party member trying to reach someone in an impossible position.

What Happens If You Don’t Save Everyone?

Honestly? The game doesn’t baby you here. People die. The story acknowledges it, and some of those deaths have real downstream consequences:

• If Ravengard dies, Wyll’s story takes a notably darker turn. The emotional resolution of that father-son arc just doesn’t happen. It’s not a game-over state, but it’s a weight the story carries forward.
• If the Gondian gnomes die, your options for dealing with the Steel Watch become more limited. The questline still resolves, but some of the more satisfying solutions get closed off.
• If Omeluum dies, it’s a sad ending to a surprisingly compelling side story. No massive mechanical impact, but if you’re playing a mindflayer-adjacent or Durge run, it hits differently.

One thing worth noting: you can actually trigger the Iron Throne mission at different points in Act 3, and the timing affects what Gortash does. If you’ve already sided with Gortash or done his content in a particular order, the mission parameters can shift slightly. The core structure stays the same, but pay attention to the political situation in Baldur’s Gate before you dive.

Hidden Details Most Players Miss

BG3 is packed with things you’ll only notice on a second playthrough, and the Iron Throne is no exception.

• There are Flaming Fist soldiers also imprisoned in the facility. They’re easy to overlook if you’re focused on named NPCs, but freeing them contributes to the broader power balance in the city.
• The submarine itself can be interacted with before you descend, and some players have found extra dialogue options based on specific class backgrounds or earlier choices.
• Using invisibility on your party before the countdown starts can give you a significant head start – Sahuagin won’t react to you in that first crucial turn.
• The environmental hazards in the prison (broken pipes, unstable sections) can actually be used against Sahuagin if you position right. It’s situational, but satisfying when it works.

The Iron Throne and What It Says About Gortash

It’s worth stepping back for a second, because the Iron Throne isn’t just a mechanical challenge – it’s a piece of worldbuilding that tells you a lot about the villain you’re up against.

Gortash doesn’t just want power. He wants control. The Iron Throne is a leverage operation – these prisoners are insurance policies. Ravengard’s imprisonment neutered the Flaming Fist. The Gondian gnomes’ captivity kept their families compliant. Everyone in that prison is there because they have value as a bargaining chip.

The fact that he’s willing to blow the whole facility up rather than let you free them says everything. He’d rather burn his own assets than let you use them against him. It’s cold, calculated, and completely in character.

This is part of why the Iron Throne hits harder than a lot of the other set-piece moments in Act 3. It’s not just a cool setpiece – it’s a character study delivered through gameplay pressure. You’re not just fighting the clock; you’re fighting the consequences of Gortash’s worldview.

Comparing Iron Throne Difficulty Across Classes

Class	How Tough It Is	Key Advantage
Wizard	Medium	Misty Step, Fly, Dimension Door
Rogue	Medium	Cunning Action dash, high mobility
Barbarian	Hard	Limited mobility options, slow rescue speed
Cleric	Medium-Hard	Great for keeping prisoners alive, slow on coverage
Druid	Easy-Medium	Wildshape + spells gives flexibility
Ranger	Medium	Ranged control of Sahuagin, decent movement

Classes with built-in mobility spells handle this mission dramatically better than those without. If you’re playing a Barbarian or Fighter without multiclass mobility options, lean hard on consumables – potions of speed, scrolls of Misty Step, anything that gets you moving faster.

FAQ

How many turns do you get in the Iron Throne mission?

You get nine turns before the prison collapses. Every action and movement counts, so plan carefully from the moment you arrive.

Can you go back to the Iron Throne after the mission?

No. Once the mission triggers and resolves – whether you succeed or fail – the Iron Throne is gone. There’s no returning later to look around.

What happens if Ulder Ravengard dies in the Iron Throne?

Wyll’s personal questline loses its resolution, and Ravengard won’t be available as a political figure in Baldur’s Gate’s post-mission story. It’s one of the more impactful deaths in Act 3.

Is it possible to save every prisoner?

Yes, but it requires a well-prepared party with high mobility and good turn management. Splitting your party effectively and prioritizing movement abilities is key.

Does the Iron Throne in BG3 affect the ending?

Saving the Gondian gnomes and Ravengard both have downstream effects on how Act 3 plays out, including options available in the endgame. Not saving them doesn’t end the game, but it narrows some paths.

Should you fight or sneak past the Sahuagin?

Generally, sneak or avoid them when possible – fighting eats turns. If combat is unavoidable, eliminate them quickly with burst damage and move on immediately.

Can you use spells like Fly or Misty Step on prisoners to move them faster?

Misty Step is self-only, so you can’t directly teleport prisoners. Fly can be cast on allies, but the prisoners aren’t party members, so options are limited. Your best bet is clearing the path and keeping yourself between threats and the people you’re escorting.

Final Thoughts on the Iron Throne

The Iron Throne is Baldur’s Gate 3 at its best – a mission that feels genuinely dangerous, respects your choices, and ties its mechanical pressure directly to the story it’s telling. It’s not a puzzle with one right answer; it’s a situation with trade-offs, and how you handle those trade-offs says something about what kind of player (and person) you are.

Whether you manage a perfect run or lose someone important, the mission stays with you. That’s rarer than it should be in big RPGs. Most “ticking clock” sequences feel artificial – you can feel the rails underneath. The Iron Throne actually makes you feel the stakes, because the stakes are real.

Go in prepared. Split your party. Know your priorities before you hit that first turn. And if things go sideways – well, that’s what save scumming is for.

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