Morrowind:The Path of the Incarnate

Quick Walkthrough
# Return to the Urshilaku Camp and speak with Nibani Maesa about the lost prophecies.
# Learn of the Seven Trials (First and Second have already been completed).
# Find out about the Third Trial from Sul-Matuul.
# Obtain some Corprus Weepings, a House Dagoth cup, and the Shadow Shield from the ruins of Kogoruhn, southeast of the camp.
# Return to Matuul with the items to learn the riddle of the Third Trial.
# Talk with Ashlanders to decode the riddle and find the location of the Cavern of the Incarnate.
# Travel to the cavern to meet with Azura and learn of the Fourth and Fifth Trials remaining.
# (Optional) Report back to Nibani Maesa and Sul-Matuul.

Detailed Walkthrough
Return to the Urshilaku Camp
After successfully rescuing Mehra Milo and learning the lost prophecies from Gilvas Barelo in the secret Holamayan monastery of the Dissident Priests, you should return to Nibani Maesa in the Urshilaku Camp. Again, there's no wrong way to get to the camp, though if you're in Holamayan still, the quickest way would be to use an Intervention scroll/spell to get out and continue on from there. One way to get to the camp is to just hop back on the boat to Ebonheart, then speak with a neighboring boatman Nevosi Hlan to travel to Hla Oad, Gnaar Mok, and finally Khuul which is the closest to the camp anybody will take you.

Learn of the Seven Trials
Once you arrive at the camp, go and see Nibani in the Wise Woman's Yurt again and talk to her about the lost prophecies. She says, in a round-about way, to come back in a day once she has thought about all you have told her. You do not actually have to wait a day. Just talk to her again, and she is ready to give you her judgment. It appears that you have at least convinced Nibani that you may become Nerevarine. Your task now, guided by Nibani, is to lift the Seven Curses of Dagoth Ur, walk the path of the Seven Visions, and pass the Seven Trials.

The First Trial is simple; you were born on an unknown day to unknown parents. You have also fulfilled the Second Trial as you are now immune to all diseases. For the Third Trial you must again talk to Sul-Matuul in the camp and, once fulfilled, return to Nibani for guidance in the remaining trials.

Sul-Matuul and the Third Trial
Asking Sul-Matuul about the Third Trial reveals that he wishes you to pass a warrior's test by braving the halls of Kogoruhn, an ancient stronghold of the Sixth House, before telling you the Third Trial. You are to retrieve three tokens from there: Corprus Weepings from a corprus beast, a House Dagoth cup, and the Shadow Shield which lies in the tomb of Dagoth Morin, deep in the lava tunnels beneath Kogoruhn. Once this is done, Sul-Matuul will reveal the Third Trial to you. Once you ask him about Kogoruhn, he will mark it on your map, a ways southeast of the camp.

Kogoruhn
Kogoruhn is a large structure which is hard to miss and has five different entrances. There is also the corpse of Feril Salmyn on the structure which has some nice Indoril medium armor among other things which could be useful. The Dome of Pollock's Eve, the Dome of Urso, and the Temple of Fey are all small, one-room shrines, each with its own Dagoth. Fey and Urso contain Dagoths Uvil and Reler who are actually quite tough spellcasters, so be careful before you enter these rooms. Pollock has Dagoth Girer, who is not quite as tough as the other two (but no pushover at low levels).

The cup and the corprus weepings can both be found in the Dome of Pollock's Eve. The cup is on the table (named as a House Dagoth cup) and the weepings can be found under the urn in the center of the room. You can also find weepings on any random corprus monsters which wander around the other halls. Unfortunately, the Shadow Shield is buried much deeper within Kogoruhn.

To reach the shield, you can enter the Hall of the Watchful Touch or the Hall of Phisto sections. Either way, you will need to reach the Bleeding Heart section by passing through the Hall of Phisto, Hall of Maki, Nabith Waterway, Charma's Breath. If you kill Dagoth Ulen (who is actually an ascended sleeper) in the Vault of Aerode, you will get a key to the Nabith Waterway; otherwise you can just pick the lock or use an Open spell. It's quite a walk and there are a number of monsters which you must pass along the way.

There is also a good deal of loot along the way, including some ebony weapons and glass armor. The Shadow Shield is lying on a stone near where you encounter Dagoth Elam. There are also some Daedric Gauntlets and an Orc Warhammer in the same area. Once you get all three items, return to Sul-Matuul in the Urshilaku Camp. One item to avoid if you are playing on a pre-1.10 patch version of the game is Fury (found on one of the dead adventurers in the Hall of Maki), as it will cause permanent damage to your armor skills if equipped. (you can fix this by praying at an Imperial Cult Altar or making a restore attribute spell or potion).

Learn the Third Trial
Sul-Matuul congratulates you on acquiring the three items and rewards you with Malipu-Ataman's Belt. He proceeds to tell you of the Third Trial. The Third Vision states ''In caverns dark Azura's eye sees/and makes to shine the moon and star. You are to travel to the Cavern of the Incarnate and look for the Moon and Star. The secret of the cavern is set in a riddle:

 
 
 

This riddle is known as Wisdom's Test. You must find the moon and star of the prophecies, and return it to Nibani Maesa.

Third Trial Riddle
To solve the riddle, talk to the Ashlanders in the camp as suggested by Matuul. You may need to speak to several people to obtain enough information. If you are carrying Malipu-Ataman's Belt when you speak to them, they will notice it and open up to you. Otherwise you may have to raise their dispositions in order to get information from them. The eye of the needle refers to a tall rock column in the Valley of the Wind. The skin of the pearl refers to a pale rock on the very top of the column. The teeth of the wind refers to Airan's Teeth, two rock spires marking the entrance to the Valley of the Wind. The spires are named after a seer, Airan, who was blessed by Azura. The valley is on the northeast slope of Red Mountain in the center of the island. The mouth to the valley is just east and south of the Daedric Shrine of Zergonipal, which should now be marked on your world map. The last clue refers to the star which is actually Azura's Star that is visible only at dawn and dusk (6 to 8 am and pm).

The riddle tells that a door to the Cave can be found at the base of the needle and will be open only during the dawn and dusk hours. To reach it, start at Falasmaryon and head towards the Daedric Shrine of Zergonipal and just east of it you should find two parallel valleys leading towards the south. Take the one to the east, marked by two tall rock spires (Airan's Teeth). Walk all the way to the end of the valley, and wait for the correct time for the door to open.

A quicker and easier way to get there would be to start from Tel Vos and just hike over the mountains to the west. If you go directly west, you should wind up midway through the Valley of the Wind. Simply follow it south the rest of the way.

Another quick way is if you have the Propylon Index or the Master Index is to teleport to Rotheran and go due south. Levitation or water walking will help with the first part of this trip.

Cavern of the Incarnate
Once you enter the Cavern of the Incarnate, you will see a huge statue of Azura. Pick up the Moon-and-Star in its hands to start a cut-scene. You have now passed the Third Trial and have indeed become the Nerevarine. Don't forget to talk with the ghosts of failed incarnates to obtain some enchanted items (each one has a different phrase that will trigger them to give you the gifts, but usually the phrase is "my story"). Some aren't particularly useful, but if you don't want to use them you can sell them.

Report back to Nibani Maesa and Sul-Matuul
It is not necessary to report back to the Urshilaku, but it makes the Fourth and Fifth Trials a little easier. Speaking to Nibani Maesa will create empty topics in your journal for all of the later quests that will allow you to bypass a little dialogue with the later givers. If you do not have the other Ashlander camps on your map, speaking to Sul-Matuul of those camps will add them to your map.

Persecution of the Nerevarine
Once you have finished the Third Trial, you will be subject to The Persecution of the Nerevarine. Both the Tribunal Temple and House Redoran become your enemies (unless you are already a member of the House) and the other factions don't seem to be pleased either. You will not be able to join the Tribunal Temple and, if you are already a member, you will not be able to finish any quests, or receive new ones. Once you have progressed further in the main quest and/or regained the trust of the Houses and the Temple, this lockout will be lifted.

Sul-Matuul will kindly warn you of this before he names you Nerevarine of the Urshilaku, but when he tells you to "finish your dealings with the Houses and the Temple", it's actually already too late.

The Fourth and Fifth Trials
Your mission now is to be acknowledged by three Great Houses as Hortator (or war leader) and by the four Ashlander tribes as the Nerevarine. These are the Fourth and Fifth Trials, and they can be done in any order or worked on concurrently. Since you're already at the Urshilaku Camp, the Urshilaku Nerevarine quest is the logical first one to complete. After each is complete, you can return to Nibani for more guidance.

Bypassing the Fourth and Fifth Trials
If your level is 21 or higher and you have at least 50 Reputation, then you do not have to complete the Fourth and Fifth Trials. Either Nibani Maesa, the Dissident Priests, or  the Great House Councilors will tell you that you should see the Archcanon, Tholer Saryoni, in Vivec High Fane right away. This will save a lot of hiking around the various camps and councilors. 

You can complete these trials anyway, regardless of whether you go to the Archcanon immediately or delay the trip. Doing so will allow you to obtain some rare loot and additional Reputation points. If you do these trials after going to see the Archcanon and receiving the Plan to Defeat Dagoth Ur from Vivec, a few NPCs may express concern that you haven't yet fulfilled the prophecy – haven't faced Dagoth Ur – but that is the only consequence (and a few may repeat that you need to go to the Archcanon despite you already having done so). There is no deadline, and you can put the Main Quest on hold to pursue other aspects of the game, or work on your stats.

Bugs
 

Quest Stages