The Lords of the Fallen Fief Key location is not immediately obvious, nor is it something you can grab nearby the door it unlocks. This door has a frozen bell on it and is located early on in the game. Here’s how to unlock the bell door in Lords of the Fallen and find the Fief Key.
How to get the Fief Key in Lords of the Fallen and open the bell door
To find the Fief Key in Lords of the Fallen and open the bell door, you are going to have to progress a little further into the game first. Keep playing past Pilgrim’s Perch and you will eventually make your outside. And shortly after seeing sunlight and touching grass, you’ll be sent back down to the depths have to fight Congregator of Flesh, a mass of flesh and teeth that is in the above picture.
After killing it, go back to Skyrest Bridge by warping to the Vestige of Ethryg. You will see a new character just to the right of the vestige named Andreas of Ebb, who was previously elsewhere on Skyrest Bridge. Speak to him a few times and he will eventually give you the Fief Key when he is done talking with you.
The Fief Key is how you will open the giant bell door with some ice on it that you passed earlier in the game. Warp to Vestige of Marco the Axe and the Redcorpse Windmill and turn around to see the gate right behind you. Go up to it and unlock it after interacting with it.
This will open up the gate after a short cutscene and lead to Fief of the Chill Curse, which is a tough area you may need to level up a few times in order to explore properly.