The Elder Scrolls IV: Oblivion/Cheydinhal Quests

The Renegade Shadowscale
Speak with Teinaava after completing The Lonely Wanderer of The Dark Brotherhood quests, to flag this side quest. This is a pretty simple assassination. Go to Bogwater, close to Topal Bay, South-East of Leyawiin. Sneak up on Scar-Tail and get your critical attack on him and then finish him off. Loot his body and remove the heart. Travel back to Teinaava in the Cheydinhal Sanctuary to receive the Boots of Bloody Bounding.

The Wayward Knight
The Oblivion Gates must be spawned all over Cyrodiil in order to begin this quest.

Go to Castle Cheydinhal and talk to Count Andel Indarys. Ask him about the Oblivion Gate. He'll tell you how one opened just outside of his town and two days before his son and a group of knights entered it, he needs all the help he can get.

Outside the Oblivion Gate
Just outside the Oblivion Gate will be a bunch of guards from Cheydinhal patrolling the area. Amminus Gregori will come over and talks to you. Ask him about Oblivion Gate and then ask him about Farwil, to get the option Knights of the Thorn. Ask him about all those again and you be set to head in the Oblivion Gate.

Inside the Oblivion Gate
The first thing you will see when you enter is a Knight of the Thorn lying dead on a concrete slab, how lovely... take the only path available southeast downward and follow the path southwest, along the edges you'll notice you can drop down skipping to the some of the turns. Your main goal is to make it east-southeast of the Oblivion Gate entrance, where you will see Farwil and another knight standing, just off a bridge.

After talking with Farwil, the Gates to the east along the bridge will be opening up. Cross the bridge and head into the tower, The Chaos Stronghold. In the tower are two doors leading to the Rending Halls, it doesn't matter which you go through. Follow the path up, which will bring you to a room with a door along the west wall that will bring you back out to The Chaos Stronghold.

Follow the path up and enter the Corridors of Dark Salvation through the door at the top. In here is a Citadel Hall Door to the north, open it and follow the path up. There will be a two doors side-by-side along the south wall, you don't have to go in them, unless you want some loot. Keep going up the path to the Citadel Hall Door and go on inside. There is a door on the west wall leading back to The Chaos Stronghold that you will need to enter.

Follow either path once through the door until you reach the top, where two doors will be, both mark Sigillum Sanguis. It doesn't matter which you enter. Inside head up the path and enter the room along the inside walls. Go up the path in here and go up the spiked staircase on either side of this area and then up the red ramp. You are at the top of the tower now, head to the center and remove the Sigil Stone.

Back Outside the Oblivion Gate
Once you close the Oblivion Gate talk to Farwil, asking him about Knights of the Thorn, he reward you with a medallion. If Farwil died, talk to Amminus Gregori outside the Oblivion Gate. He'll send you back to the count. Go back to Castle Cheydinhal and talk to Count Andel Indarys. If Farwil survived Oblivion, you will have the option to of chosing a staff or sword, after you pick, the quest is be complete, but will have to turn over the Indarys Signet Ring. If Farwil died, you get to keep the ring, but will ont be rewarded further...