Shivering:Rebuilding the Gatekeeper

Quick Walkthrough
 
#Travel to Xaselm and find Relmyna Verenim.
#Travel to Gardens of Flesh and Bone and collect the items.
#Return to Relmyna and build your gatekeeper.
#Report back to Sheogorath.

Detailed Walkthrough
Sheogorath tasks you with rebuilding the Gatekeeper to quell the forthcoming invasion of Order. With the addition of Xedilian and a new Gatekeeper, New Sheoth's defenses will be impenetrable. You are to travel to Xaselm and speak with Relmyna Verenim about constructing a new Gatekeeper. If you speak with Haskill, he will mark Xaselm on your map, enabling you to fast-travel there. 

Finding Relmyna
Upon arriving at Xaselm, you will be greeted by Relmyna's undead minions; chiefly, skinned hounds, flesh atronachs and failed experiments.
Fight or avoid the undead denizens until you reach Relmyna's chambers in the Sanctum of Vivisection.

Collecting the Ingredients
Relmyna will initially be quite resentful towards you for killing her original Gatekeeper, but will eventually agree to construct another. She tasks you with the collection of four components, Osseous Marrow, Dermis Membrane, Essence of Breath and Blood Liqueur, from the Gardens of Flesh and Bone in the Fringe. She will also grant you a key so that you may access the back entrance to Xaselm in the future.

Travel to the Gardens of Flesh and Bone and enter. It is easiest to collect each item in chronological order, as the map marker will highlight each respective item. Following the map markers will generally result in a linear dungeon crawl that will culminate at each respective item. The only noteworthy exceptions are the Essence of Breath and Blood Liqueur.  Because of the multitude of criss-crossing tunnels, the Breath cannot be easily located using the map. A perpetual green mist, however, continually flows through the tunnels, indicating the path to the Essence of Breath. To reach the Blood, once you reach a closed door you will see a boss chest and three pushblocks. Activate the one facing the door to open it, as the other two cause hunger traps to activate and rocks to drop. Collect all the items and return to Relmyna.

Building the Gatekeeper
After bringing Relmyna the components, she will ask you to choose the parts for the Gatekeeper. Follow the map marker and choose a head, a torso, a heart, a right arm, a left arm, and a pair of legs from the selection. The choice of parts will be relevant at a later stage of the quest. Information about the various body parts can be found in the Miscellaneous Items article. Once you have chosen, speak again with Relmyna, who will instruct you to meet her at the Fringe. Proceed to the Gates and await her arrival. She will perform the Ritual, requesting at each stage that you place a component into the Cistern of Substantiation, before binding the components together to summon a new Gatekeeper. Be careful, if you are too close to the Cistern, you will be knocked down due to shockwaves, but it will not affect your health, and is just an inconvenience. 

Speaking to her again, she will thank you again and gift you with the greater power Summon Flesh Atronach. Shortly after, the Gatekeeper will come under attack by a group of Order Knights, led by the traitor Felas Sarandas; although it should have no trouble destroying them.

To collect your reward, activate the Gatekeeper and you will receive one of the greater powers associated with the body parts chosen earlier (although you can only have access to one Gatekeeper greater power at a time).

Return to New Sheoth and report back to Sheogorath.

Notes
During your journey through Xaselm, you can encounter a number of traps, test chambers, and experiment logs. The experiments can be activated by pressing the various buttons around the chambers.
When you encounter Relmyna, she is torturing prisoners in cages with spells. You can also kill them with magic, but it will not count as murder or incur a bounty.
If you have read Experiment Log - Day 12 or Unproductive Musings in the Sanctum of Vivisection, Relmyna will have a "Victims" dialogue option.  You can select this to demand that Relmyna release her prisoners and offer yourself for experimentation in their place. See her page for details.
During the ritual, a powerful blast of energy will knock you off your feet. This effect is harmless, however.
Unlike his predecessor, the new Gatekeeper is flagged as essential.
The new Gatekeeper will not be hostile towards the player unless you strike him (although he may be hostile to Ushnar's Skinned Hound). You can't yield to him, so your options are to run for your life or try to defeat him. 
Choosing the Heart of Wound Sharing body part is one of the few ways to obtain the Reflect Damage spell effect.
Upon successfully completing the quest, a trophy of an axe, a mace, or a sword (depending what was chosen for the Gatekeeper's right arm) will appear on a platform in Sheogorath's Palace.
 An achievement will be unlocked upon completing this quest.

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