Morrowind:Malacath of the House of Troubles

Quick Walkthrough
# Talk to Endryn Llethan‎ and receive the key to the Archcanon's office.
# Talk to Archcanon Tholer Saryoni in his office for your duties.
# Get four daedra's hearts to visit the Statue of Malacath as part of the Pilgrimages of the Four Corners.
# Travel to Sheogorad and find the statue southwest of Dagon Fel.
# Activate the shrine with your four hearts to receive the poem Four Corners of the House of Troubles and the Blessings of the First Corner.

Detailed Walkthrough
Duties
Once you reach the rank of Diviner, Endryn Llethan‎ at the High Fane in the Vivec's Temple Canton will tell you that Archcanon Tholer Saryoni wishes to speak with you. He will give you the key to the Archcanon's quarters in the Crosier of the High Fane. Go speak with the Archcanon and he  will ask you to perform yet more pilgrimages, this time the Pilgrimages of the Four Corners. You must visit and activate four shrines related to the four 'bad' Daedra Lords (Four Corners of the House of Troubles). The shrines must be visited the correct order for you to be able to complete the pilgrimages. Visit Saryoni after you complete each portion to get more information on the next part.

Archcanon Saryoni then tells you that the First Corner of the House of Troubles is Malacath. Visit his shrine southwest of Dagon Fel (west of Mzuleft, nestled in some hills) with four Daedra's Hearts and recite the poem Four Corners of the House of Troubles.

Malacath of the House of Troubles
If you've been fighting any Daedra, chances are you have a good supply of hearts already, but if not, a good number of alchemist shops also sell them (Nalcarya of White Haven in Balmora for example). Once you have your hearts, find the shrine, which is simply a large Statue of Malacath surrounded by a number of Orc worshippers. Activate the shrine with your four hearts in your inventory by getting close and clicking when the name appears, to receive the poem (which you don't really have to recite) and the Blessings of the First Corner (Fortify Strength 10-20 pts for 48 min).

Return to Archcanon Saryoni in Vivec for instructions on the next Corner of the House of Troubles.

Notes
There is another shrine of Malacath inside Assurdirapal, and activating the statue in it opens Malacath's Quest. That shrine will not work for this House of Troubles quest, or vice versa.
Cursed Daedra Hearts will not work; you must have four non-cursed hearts to complete this quest.
It is also possible to complete this pilgrimage and receive the blessing by carrying four non-cursed Hearts and simply touching the statue, without receiving or even speaking to any of the quest givers earlier.
There are four mid-level Orc worshippers at the shrine, each clad in Orcish and steel armor, some of whom wield Orcish weapons. They will usually be hostile, though their lookout on the trail around the corner is less apt to attack.

Bugs
Due to a bug, it is possible to receive this quest by speaking to Saryoni about bad daedra and then four corners and do  the Pilgrimages of the Four Corners and Mount Assarnibibi pilgrimage at any time – even if you aren't a member of the Tribunal Temple. Some of the Four Corners pilgrimages need to be done in order, and all four are required for the Mount Assarnibibi pilgrimage to get the Ebony Mail. There are no known issues with this, so if you later decide to finish the Temple faction's quests you should be fine.

Quest Stages