The Elder Scrolls V: Skyrim Switch Cheats and Tips

I struggled with this as well. Basically all two-handed weapons can be swung one of two ways, horizontally, and vertically. It's hard to get the hang of at first, but you need to tilt the stick in the horizontal or vertical direction as you swing, this will cause the energy waves to either be horizontal or vertical. Then you just need to line up the energy waves with the correct positions on the door and it will open. Good luck!

The appraiser is a girl named Vex in Riften you have to get 24 pieces before she'll buy it from you. She is part of the Thieves Guild.

The quill of gemination is located in between goldenglow estate and riften at the bottom of the lake. There is a boat docked at goldenglow estate pointing towards riften and a boat docked at riften pointing to the other boat. Locate these two boats, and near the middle point between them at the bottom of the lake you will see half a sunken ship. The quill is in the strongbox next to it.

The first one (left piece), Arkngthamz. The others: Deep Folk Crossing (upper piece), Raldbthar (right piece) and Mzulft (lower piece)

To open the door, equip the Bloodskal Blade. When doing a power attack, a red beam will come out of the blade. If doing a horizontal attack (done by moving to the side while doing a power attack from a standing position), a horizontal beam will come out, while a straight power attack results in a vertical beam. From the top of the stairs, with the reticle aimed at the glowing red fissures found at the left and right sides of the door, a horizontal power attack will unlock a horizontal red fissure. When a vertical fissure appears, a vertical power attack will unlock it. The sections of the walls will alter themselves along with the red fissures; continuing to aim the reticle and matching attack with the red fissures will eventually result in each side having no visible red fissures left. Now the door can be hit vertically with the reticle aimed along the new, centered red fissure. This will open the door