Oblivion:Weynon Priory (quest)

Quick Walkthrough
# Take Martin to Weynon Priory.
# Kill the red robed assassins.
# Run to the chapel and help Jauffre kill the assassins inside.
# Go with Jauffre and check on the amulet.
# Escort Jauffre and Martin to Cloud Ruler Temple.

Detailed Walkthrough
Red Robed Agents
thumb|right|Oblivion:Brother Piner|Brother Piner overwhelmed by Mythic Dawn Agents
After closing the Oblivion Gate in Kvatch, you are to take Martin to Weynon Priory. 

Upon arrival, Eronor will run to greet you with some bad news: Mythic Dawn agents are attacking the priory. If you attack the Agents before Eronor has a chance to speak to you, it will count as an assault - this is difficult to do, however, since Eronor is already outside, waiting for you to arrive and is scripted to come to you even if you are invisible. In the name of the late Prior Maborel, you must kill these assassins with the help of Brother Piner. After they're dead, you'll find that Jauffre has his hands full killing more agents in the chapel. Head over there and help him finish them off.

Cloud Ruler Temple
thumb|right|Cloud Ruler Temple
After you help Jauffre kill off the assassins, he will want to check on the Amulet of Kings. As he suspected, the amulet has been taken and will need to be recovered. Jauffre suggests taking Martin to Cloud Ruler Temple, a safe haven for the Blades located to the northwest of Bruma. When you arrive, follow Martin as he is welcomed and hailed by the Blades as Emperor Martin Septim, Dragon Born. After Martin gives a speech to the soldiers, he speaks with you about the importance of recovering the Amulet of Kings.

Joining the Blades
Jauffre will offer you membership into the Blades. If you accept you will be given an Akaviri Katana and you will have access to all the beds, books, armor, and weapons inside the temple. After you make a decision about membership, Jauffre will give you your next quest.

It is not necessary to join the Blades in order to continue with the main quest, nor is this your only chance. If you later change your mind, you can just talk to Jauffre again and choose the topic "Join the Blades" — as long as Jauffre is still alive (he can die during the Defense of Bruma or Light the Dragonfires, at which point it becomes impossible to join the Blades) and his disposition towards you is 40 or higher.

Cloud Ruler Temple is not the only place made available if you join the Blades. As a chapter-house of the Order of Talos, Weynon Priory will become freely accessible to you if you join.

Notes
This quest can be combined with The Killing Field. Start the quest but don't meet the Odiil brothers until you bring Martin to the Priory. The brothers will help with the agents outside the priory. You can thank them by taking Martin and Jauffre to their farm for some goblin disposal.
Jauffre and Martin will continue to follow you across Cyrodiil until you take them to Cloud Ruler Temple, so you might want to make use of them in completing other quests beforehand. Be wary when entering towns however, as Mythic Dawn Agents will attack your group on sight.
If you want a black robe (a rare, weightless item of clothing), Prior Maborel's corpse has one.
If Jauffre dies during the battle with the assassins, the game ends with the message "You have failed. Jauffre has been slain. All hope is now lost.", and you will have to reload from a previous save.
If you leave Martin too far behind while escorting him to the Priory, he may instantly mount a Weynon Priory Horse to catch up, even though you haven't reached Weynon Priory yet.

Bugs
A number of odd things may occur during the 'Escort Martin to Cloud Ruler Temple' part of the quest:
 
 
 
 

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