How to Rescue Every Prisoner in the Iron Throne Without Losing Your Mind

The Iron Throne is arguably the most stressful encounter in Act 3 of Baldur’s Gate 3. It is a high-stakes, underwater prison break where the environment is literally ticking toward total destruction. Whether you are aiming to save Duke Ravengard for Wyll’s questline, rescue Omeluum for the Society of Brilliance, or free the Gondian workers to sabotage the Steel Watch, efficiency is your only currency.

Successfully navigating this mission requires more than just high damage output; it demands a mastery of movement speed, action economy, and environmental interaction. In this deep dive, we will break down exactly how to manage the turn limit, protect the vulnerable NPCs, and ensure your entire party makes it back to the submersible before the facility implodes.

Quick Summary of the Iron Throne Requirements

If you are looking for the immediate essentials, here is the baseline for the Iron Throne:

Location: Accessed via the basement of Flymm Cargo in the Lower City (Grey Harbor).
Access Method: A submersible piloted by Redhammer the Deviser.
The Timer: Based on difficulty. Explorer gives you 8 turns, Balanced gives you 6 turns, and Tactician/Honor Mode grants only 5 turns.
The Fail Condition: Anyone not inside the submersible when the timer hits zero is killed instantly.
Crucial Prerequisite: Do not kill Lord Gortash before completing this mission, or the Iron Throne will be destroyed, killing everyone inside instantly.

Essential Preparation Before You Dive

Entering the Iron Throne without preparation is a recipe for failure. Once you dock, the countdown begins, and you cannot go back to camp to change spells or grab items.

Recommended Party Composition

While any balanced party can succeed, certain classes excel in the Iron Throne’s unique environment:

The Rogue or Monk: High base movement speed and the ability to Dash as a bonus action (Step of the Wind or Cunning Action) make them perfect for reaching the furthest wings of the prison.
The Wizard or Sorcerer: Access to Misty Step, Dimension Door, and Haste is non-negotiable. Magic Missile is also a secret weapon here—each missile can trigger a lever from a distance, allowing one caster to open three cells in a single turn.
The Cleric: Sanctuary and Mass Healing Word are vital for keeping NPCs alive as they dash toward the exit.
Summoners: Druids or Necromancers can bring summons to distract the Sahuagin enemies. These summons don't need to return to the submersible, making them expendable decoys.

Must-Have Spells and Items

Before you interact with the hatch in the Flymm Cargo basement, ensure your inventory is stocked with:

Potions of Speed: These grant the Hastened condition for 3 turns. Use them wisely, as the Lethargic state afterward can be fatal if it triggers in the middle of a flooded corridor.
Elixirs of Bloodlust: If your high-damage characters can kill a Sahuagin, they get an extra action to use for Dashing or opening doors.
Arrows of Transposition: A fantastic way for non-casters to "teleport" across large gaps.
Dimension Door Scrolls: Every party member should carry at least one. It allows you to move yourself and a slow NPC (like Duke Ravengard) massive distances.
Longstrider: Cast this on your entire party at camp before leaving. It’s a ritual spell that lasts until a long rest and provides a free movement buff.

Finding the Entrance at Flymm Cargo

The Iron Throne is not marked clearly on your map until you discover the entry point. Head to the Lower City docks and find Flymm Cargo (X:-165, Y:-150). The building is guarded by Worgs and small mechanical watchers.

Once inside, you need to reach the basement. You can find a hatch hidden under some crates in the northwest corner of the warehouse. Descending into the basement leads you to a secret dock where Redhammer the Deviser operates a submersible.

You can persuade, bribe, or intimidate Redhammer into taking you down. However, be aware that as you approach the Iron Throne, Lord Gortash will contact you. He will warn you to turn back. If you proceed, he initiates the self-destruct sequence. This is the point of no return.

Understanding the Stakes: Turns and Consequences

The difficulty setting of your game dictates your margin for error.

Explorer (8 Turns): Generous. You have time to loot a few chests and miscalculate a move or two.
Balanced (6 Turns): Tight. You must reach the furthest cells by Turn 2 and have everyone heading back by Turn 4.
Tactician/Honor Mode (5 Turns): Brutal. There is no room for wasted actions. Every character must contribute to either a rescue or a distraction.

If a party member dies because they didn't reach the submersible, they can be revived by Withers at camp for 200 gold. However, if a quest-critical NPC like Duke Ravengard or the Gondians die, they are gone forever.

Strategic Map Breakdown and Movement Plan

The Iron Throne is shaped like a cross, with a central hub where the submersible docks. To save everyone, you must split your party. Sending all four characters in one direction is a guaranteed way to let the other prisoners drown.

The Central Hub

This is where the ladder to the submersible is located. Two prisoners are usually located in the immediate vicinity. One character should handle these while moving toward a larger wing.

The North Wing: The Loot and the Gondians

The North wing contains several Gondian prisoners and some of the prison's better loot. This area is often the most crowded with Sahuagin guards.

Strategy: Send a character with high AOE (Area of Effect) damage or a strong summon here. They need to clear the path so the Gondians, who have low HP, don't get intercepted.

The West Wing: Multiple Gondian Cells

The West wing houses two cells containing the majority of the Gondian families.

Strategy: This is a "run and gun" mission. A character with Misty Step or Cunning Action: Dash should sprint down here, hit the levers, and immediately start moving back toward the center to support the East wing.

The East Wing: Duke Ravengard and the Mizora Variable

This is the most narrative-heavy section of the map. Duke Ravengard is held here, and his rescue is complicated by Wyll’s pact status.

Strategy: Send your most durable character or a Cleric here. You need someone who can either heal the Duke or protect him with Sanctuary.

The South Wing: Omeluum’s Secret

If you completed the Society of Brilliance quests in Acts 1 and 2, Omeluum will be found here. He is tied to a chair in a flooded room far to the southwest.

Strategy: Omeluum is actually the easiest to save if you know his secret: he has a unique ability to Teleport to Submersible that takes himself and one other person directly back to safety. Send one character here (ideally Gale or a high-mobility Rogue). Once they free Omeluum, Omeluum can teleport them both back to the sub instantly, effectively removing that party member from the danger zone.

Special Rescue Strategies

How to Save Duke Ravengard from Mizora’s Malice

Rescuing the Duke is the highlight of the mission. When you open his cell, he becomes a controllable follower. However, if Wyll has broken his pact with Mizora, she will appear immediately after the Duke exits his cell.

The Trap: Mizora will cast a spell that forces the Duke to kneel, wasting his turn, and she will summon "Combustion Belly Spiderlings." These spiders will rush the Duke and explode, likely killing him instantly since he starts with low health.
The Counter:
- Sanctuary: Cast Sanctuary on the Duke while he is still in the cell or immediately upon his exit. The spiders cannot target him.
- Dimension Door: Use a party member to teleport the Duke away from the spiders before they can explode.
- Healing: Use a high-level Cure Wounds or Heal to boost his HP so he can survive a blast.
- Protection from Fire: If you can pre-cast this, the spider explosions do significantly less damage.

Saving the Gondians: Managing the "Glimpse of Freedom"

The Gondian prisoners have a status called "Glimpse of Freedom," which allows them to Dash as a bonus action. However, their AI can be... questionable. They will often run through fire or ignore safe paths.

Clear the Path: The Sahuagin will use "Net" to restrain prisoners. If a Gondian is netted, they will likely die when the facility explodes. Ensure you have someone near the central hub to kill any Sahuagin that spawn from the water in the final turns.
Don't Block the Ladder: If your party members are standing on the ladder or the base of the submersible entrance, the NPC AI might pathfind poorly and wait at the bottom. Keep the path clear.

Omeluum: The Emergency Exit

If you find yourself with a character trapped at the far end of the North or West wing with only one turn left, and Omeluum is still available, remember his teleport. While Omeluum is usually found in the South, if you can get your struggling character to him, he can save them. More commonly, the character who goes to save Omeluum should be the one you are least worried about, as they have a guaranteed teleport back.

Pro-Tips for Maximizing Action Economy

The Magic Missile Lever Trick

One of the most effective "pro" strategies is using Magic Missile to open cells. Most cells are opened by a lever next to the door. These levers are "interactable objects" that trigger when they take any damage. Since Magic Missile creates multiple projectiles that can be aimed independently, a single level-1 spell can open three different cells if you have line of sight. This saves you from having to walk up to each lever.

Throwing Potions

You can throw a Potion of Speed or a Healing Potion at a group of Gondians. If the bottle shatters near them, they gain the benefits. Giving a group of four NPCs Haste can be the difference between them reaching the ladder and being caught in the blast.

Using Summons as Decoys

Sahuagin Champions hit hard. Instead of trying to kill every enemy, use Spiritual Weapon, Guardian of Faith, or summoned Elementals to stand in the doorways. The AI will often prioritize attacking the nearest target, allowing the prisoners to run past safely.

Closing Doors

If you have cleared a wing and all prisoners are out, you can actually use a lever to close the doors behind you. This prevents the Sahuagin that spawn in the water from chasing you back to the hub.

What Happens After the Escape?

Success in the Iron Throne has massive ramifications for the rest of Act 3:

The Steel Watch Foundry: If you save the Gondian families, the workers in the Foundry will no longer be coerced by Gortash. They will rise up and help you fight the guards, making the destruction of the Steel Watch much easier.
Wyll’s Story: Saving Duke Ravengard allows for a reconciliation between father and son and provides critical information about the Ansur the Dragon questline.
The Society of Brilliance: Saving Omeluum provides you with unique merchant items and a powerful ally for the final battle.
Redhammer’s Fate: Upon returning to the surface, you will be met by the Waveservants of Umberlee. They want Redhammer for his "crimes against the sea." You must decide whether to protect him or hand him over.

Conclusion

The Iron Throne is a masterclass in tactical RPG design. It shifts the objective from "kill the boss" to "manage the clock." By splitting your party, utilizing movement-enhancing spells like Misty Step and Dimension Door, and using the Magic Missile trick to open cells, you can save every single prisoner even on the hardest difficulty.

Remember: the goal isn't to kill every Sahuagin. The goal is to survive. As long as your main character and the key NPCs are on that submersible when the timer hits zero, you have won.

FAQ: Frequently Asked Questions about the Iron Throne

What happens if I kill Gortash before going to the Iron Throne? The prison is rigged to Gortash’s life signs. If he dies, the facility is immediately destroyed. You will find the ruins underwater, but all prisoners, including the Duke and the Gondians, will be dead.

Can I use the 'Knock' spell on the cell doors? Yes, but it is a waste of a spell slot. All doors have levers nearby that can be activated for free with a basic attack or by clicking them. Save your spell slots for Misty Step or Invisibility.

How do I stop the Sahuagin from spawning? You can't. They will continue to spawn from the bubbling pools in the water corridors. The best strategy is to slow them down with difficult terrain (like Ice Storm or Web) rather than trying to eliminate them all.

What if Duke Ravengard dies during the escape? If he dies in the prison, you can't revive him because his body will be lost in the explosion. If you want his quest to continue, you must ensure he reaches the submersible.

Is there any loot worth staying for? There is a Mind Flayer Parasite Specimen near Omeluum and some high-value gems in the North wing. However, unless you are on Explorer difficulty with 8 turns, it is generally recommended to prioritize lives over loot.