Fortress Roof

Fortress Roof (AR1204)

   Now this is it, you can feel it in your bones. This is the grand finale. Walk to the centre and see all your companions lying on the floor and there is nothing you can do about that just now. Keep on walking and meet the transcendent one. Talk to him and find out that he is your mortality. Ask him all you want to know.

The options

   From here there are three possible solutions. The first is that you die, the second is that the transcendent one dies and the third is that you merge with the transcendent one. There are several ways that can lead to one of these three outcommings.

Death becomes you

   You die by using the blade of immortality on yourself or by unmaking yourself with your will for which you need a wisdom of at least 23.

Death becomes him

   The transcendent one dies by attacking him or unmaking him with your will, for which you also need to have a wisdom of at least 23.
If you want to attack him then make sure that you challenge him in resurrecting one of your companions. He will not do that but it will teach you a way to do it yourself, you can resurrect two of them. If you are a mage like I was then resurrect two fighters, such as Morte and Dak'kon (or Vhailor if you have him). If you are not a mage then resurrect next to a fighter also Dak'kon for his magic capabilities. Freeing them gets another 2000000 XP, an increase in strength, decterity and constitution.
Next to this you can also lie to him and tell him that you set the shadows free. He then goes to check that out, which gives you enough time to free even more of your companions.
Now the trick is to let the fighters attack him. This makes sure that he does not cast too much spells and the mage has then his hands free to throw his spells at the transcendent one. Some of these high level spells have some real cool animations, so make sure to use them all. Killing the transcendent one gives you an additional 64000XP.

Staying alive together

   The last possibility is to merge with the transcendent one, by threatening him to kill yourself with your blade of immortality, threatening to unmake yourself with your will (at least a wisdom of 23) or just force him to merge with you.
The advantage of merging with your mortality is that you get to resurrect all of your party members and can talk to them before the game ends.

The grand finale

In the case you killed your mortality or you merged with it, you get to see the final animation that leads you to the blood war on Baator, which is the end of the game