Pfft. Have two people go to the dukes room. Doesn’t matter who. It’s better if you haste potion first but depending on the difficulty you might not have to. Throw health potions at the duke. Then throw him from his cell. It gets him clear of the spiders. Then throw a haste potion on the duke and you’re good to go. Also the doors leading to the room with the respawning sahuagin can be shut with the lever beside the door. Keeps those fuckers away from your Gondians.