The Seal of Three
A large Maulborn force used the sewers to sneak into Mournhold. I need to find them before they can complete their nefarious plan.
Enter the Tribinal Tempel
Almalexia informed me that the Maulborn unleashed Daedra into the Tribunal Temple. I should enter the Temple and banish the Daedric invaders.
Pass Sotha Sil's Trial
I need to find a way to repair the Arbiter of Perfection, and then I need to destroy it. When I'm done, I should receive the blessing of Sotha Sil.
Pass Vivec's Trial
Defeat Maulborn Priest Sathram
I found a Maulborn high priest in the High Chapel of the Tribunal Temple. He must pay for his crimes.
— game journal
The trial of Sotha Sil involves repairing constructs and then destroying them. I should examine the Arbiter of Perfection and it's surroundings to get started. For the trial of Vivec, one must decide, who carries the greatest guilt.