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Arriving at the Iron Throne triggers a countdown, whose duration depends on difficulty: 8 turns on Explorer, 6 turns on Balanced, and 5 turns on Tactician or Honour. When the countdown finishes, any characters who have not returned to the submersible are instantly killed, possibly failing their respective quests. Killed party members, however, can be revived after leaving the Iron Throne.
The prison is made up of a central area with four tunnels leading off in each cardinal direction. Each tunnel has 
or 
Double Glasshouse Doors at the end, which can be closed by using a lever inside the tunnel next to the door. All tunnels also have a pair of heat detectors. If these detectors are destroyed, or if any fire effect occurs in the tunnel[Needs Verification] (including the Oil Barrels), it will close doors at both ends of the tunnel.
The cells can be opened most easily by using the levers (which does not cost an action), or alternatively by hitting them with ranged attacks.
There are various types of hostile Sahuagin patrolling the corridors, and more that spawn over time from the deep water in the southern hall. With their low damage output and overall weakness they are unlikely to be a real threat to the party at this point, but they can kill the prisoners or ensnare characters with their nets.
Gondians
As part of 
, there are thirteen Gondians located throughout the prison. They will take no actions besides 
, which together with their 
condition allows them to move very quickly.
- Caralee Grollo in a cell south-west of the central ladder
- Flansy Thornwhist in a cell north-east of the central ladder
- Obelia Toobin south of the central ladder, not in a cell
- Santoria tied up in a chair outside the southern cell
- Thindo Vintervur in the southern cell
- Ceres Olsin, Ogro Nettles and Zumbo Pumbo in the northern of the two western cells
- Deedle Ofran and Marlono Rhandle in the southern of the three eastern cells
- Featherweight Falson, Hastar Biggs and Phoenix Lubbins in the southern of the two western cells
Duke Ravengard
Grand Duke Ulder Ravengard can only be saved if Gortash's coronation has been attended. If Wyll has been recruited, it is highly recommended to speak to him after the coronation, and then return to camp to see Mizora's bargain, as part of and . Wyll does not have to accept Mizora's new pact to save his father, but doing so makes it easier.
Duke Ravengard is in the block of cells directly east from the ladder to the submersible. He is in the middle cell, and is damaged to only 35 HP. He will also have the 
status, unless Wyll wasn't recruited. Upon opening the door to his cell, the party gains control over the Duke's movements. However, once he leaves the cell, if Wyll broke his pact with Mizora, then she appears and attempts to have him killed; she gives him the 
status for one turn, preventing him from moving and giving him Disadvantage on Dexterity saves, and summons multiple Combustion Belly Spiderling, which try to self-destruct on him. The Duke can be helped to survive or avoid the spiders using a variety of means including healing, 
, 
, 
, or 
. Mizora does not appear if Wyll has died before resigning their pact. If Mizora is unable to appear, because she is under the effects of Flesh to Stone or similar, the Spiderlings will still spawn, but Ravengard will not be forced to kneel, making him much easier to save.
Omeluum
Omeluum may be found here as part of . It will be unavailable if it was previously killed or if was completed by giving the egg to Lady Esther. It can be found down the southern path, in a cell, strapped to a chair, and must be freed with the Help command. Next to it on the table is a Mind Flayer Parasite Specimen, and the nearby backpack contains valuable selections from Omeluum's merchant inventory.
Omeluum's allows it to teleport itself and another ally to the submersible, which makes escape for the party member who freed him much easier. There may even be time for Omeluum to help others -- for example Omeluum can whisk Duke Ravengard to safety.
Cells
There are nine locked cells throughout the prison, each locked by a Glasshouse Door which can opened and closed by pulling a nearby lever, or lockpicked with a 
Sleight of Hand check (DC 21-25). Hitting a lever with any ranged attack or even an explosive blast will cause it to activate and open the door.
Related Quests
Related locations
Related literature
Notable Loot
Notable items obtained in this location, whether looted, purchased, or obtained as a quest reward:
Duke Ravengard's Longsword dropped by Duke Ulder Ravengard
Emblazoned Plate of the Marshal dropped by Duke Ulder Ravengard
High Security Vault n°6 Key in the north-western room
Infernal Iron in the room below the submersible
Mace +1 on the corpse of Waldemar Prinski, in the northern room
Mind Flayer Parasite Specimen in the south-western cell
Missive to Prinski on the corpse of Waldemar Prinski, in the northern room
Creatures
Notes
- Since the turn limit effectively imposes a limit on the total number of actions the party can take, the task can be made significantly easier by bringing along as many summoned creatures, pets, familiars, etc. as possible, to increase the total number of actions possible. Many summoned creatures are not capable of interacting with objects (and therefore can't open the doors, unless they attack the lever) but they can be helpful in managing the Sahuagin, protecting the prisoners, and getting in the way of the threats to Ravengard (if applicable).
- Likewise, increasing the total number of actions through the use of Haste spells/scrolls and Potions of Speed will help immensely. In the case of Haste spells be careful to avoid situations which would break concentration. In the case of potions, quaffing a new potion as a final bonus action after expending all regular actions, on the turn when the Hastened condition is set to expire will allow continuation without incurring the Lethargic condition -- which could prove problematic or even fatal.
- Sahuagin confronted with a closed door will often stop to try to break it down, which is usually futile as they cannot do enough damage in a single normal hit to overcome the doors' Sturdy condition. Closing some of the doors to the central area can thus effectively neutralize them, though this may make it impossible to rescue anyone still on the other side.
- Any character that died either during the escape or because of the structural failures will wash up on the small beach south of Old Garlow's Place.
- Although likely a bug, it is possible to jump from the submarine into the prison directly through the use of
and 
. The timer only starts ticking when a character interacts with the ladder, so entering this way allows the party to explore the prison at their leisure, eliminating the enemies and recovering loot without a time limit. The easiest way to do this is stacking the two boxes in the submersible and climbing on top of them, which pushes the party member out of the submersible, who is then able to jump into the prison. However, releasing any of the prisoners prior to starting the timer will put them in a broken state where they will not attempt to escape even after the timer starts, making it impossible to rescue them. - The Iron Throne will be destroyed if the Steel Watch Foundry is destroyed earlier. Also, if you kill Gortash, the Elder Brain will destroy the Foundry.
