Chillbreath Caverns (Mistpeak Valley)
Silver Key #40
Enter the cavern from the entrance that is above and near the Demon Door in Mistpeak Valley. Then travel along the path and not far ahead will be the key on a ledge.
If you have not completed the Missing Child quest, the girl will be below from here or if you entered the cave another way, you will see it just near her above on the ledge but unable to grab it.
The Ossuary (Mourningwood)
Silver Key #41
You will find this key in the open crypt in front the entrance to the Ossuary from Mourningwood. It will be in the 4th crypt from the right.
Silver Key #42
First climb the stairs of the tomb near the entrance from Mourningwood. Then turn left at the first landing which is before the golden door. Then leap off the ledge here to land on the level containing the key.
Pepperpot Cave (Millfields)
Silver Key #43
You will find this key after the small pool of water at the far end of the cave on land. Pepperpot Cave is located in Millfields by the mining factories.
Sunset House
Silver Key #44
To grab this key head up the path to the large clearing and then head to the right and into the forest. The key will be in here amongst the trees and rocks and to the left of the golden door.
You can get to Sunset House from Mourningwood.
Silver Key #45
This key will be amongst the rocks to the left as you enter Sunset House area. It will also be to the left of the Demon Door.
Sewers (Bowerstone Industrial)
Silver Key #46
Find the sewer entrance that is beneath the crane in the far corner of Bowerstone Industrial. Then turn right at the first junction. The key will be around the corner near the metal bars.
You will not be able to reach this key if you enter from the sewer entrance leading to the Resistance Headquarters.
Dankwater Cavern (Millfields)
Silver Key #47
You will need to first complete the Hobnobbing with Hobbes quest in order to fully access the cavern and get to the other area where the 2 keys are at.
Once you have completed the quest and waited a short time, head back to the cavern. Then swim to the far left to the shore that has a hill that leads upwards. Once you are at the top of the hill, head to the left of the path to reach the key overlooking the entrance you came from.
Silver Key #48
You will need to first complete the Hobnobbing with Hobbes quest in order to fully access the cavern and get to the other area where the 2 keys are at.
Once you have completed the quest and waited a short time, head back to the cavern. Then enter the water near the hobbe camp. Then swim a counter-closewise spiral through the rocks and go right to work your way up the sloping path in the far left corner to grab the key.
The Veiled Path
Silver Key #49
Head to the far end of The Veiled Path and the key will be in the right corner at the top of the stairs behind a circular stone piece.
Silver Key #50
Enter the area called The Enigma and shoot the flit switch to enter the 2nd room. Then light the 2nd brazier with the Fireball spell to open the nearby door. Go through the door to find the key at the top of the small circular platform.
You will also find the 4th Gold Key in The Enigma as well.
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