Explore the Everfall
Report back to Barnaby
Talk to Barnaby when you're ready then go down to the Pawn Guild's basement. Enter the door there to reach the large underground tower called the Everfall. Follow the path until you reach a gate. Enter to the left then fight your way through the corridors until you reach the other side of the gate. You can find a lever here that will remove the gate but will alternately close the other path you've gone through.
Continue along the ramp and you'll encounter another gate and an ogre behind it. If you're a magic user, you can attack and defeat it safely from behind the gate; otherwise, you have to do the same thing again and fight through the alternate route to reach the other side of the gate. Again, you have the option to open the gate or not using the lever.
Continue forth until you reach another gate. Go through the third alternate route and find the lever to the north to open the other gate. Continue east of the ceremonial cage and open the stone caskets. A skeleton will emerge from one of those caskets. Defeat it to retrieve an engraved lever. Attach the lever to the slot beside the gate ahead to access the chests in the other side.
Proceed to the other path to reach the marked location. Before checking the Flameservant’s Throne at the bottom floor, scour the area and make sure that the room is clear of enemies. This will make your job easier later on. Beside the stairs leading to the spiral ramp is a balcony containing a few treasures and gold coins. Once ready, examine the Flameservant’s Throne to trigger a scene.
Tentacles will start appearing. You don’t have any way of defeating these so start running to the exit. Mushrooms and Liquid Vims will help a lot in making your escape. If you have a ferrystone or Eternal Ferrystone, you can use these instead to teleport back to the portcrystal, right outside the Pawn Guild. Talk to Barnaby to complete the quest.
Yes how do you open the bib gatei n The shadow fort