Morrowind: Nerevarine Cult
The Nerevarine Cult, associated with the Urshilaku Ashlanders, believes that the Tribunal--the three god-kings Vivec, Almalexia and Sotha Sil--are false gods whose power is stolen from the Heart of Lorkhan. Instead of worshipping the Tribunal, the cult is devoted to a mortal leader who died of his wounds after victory in the Battle of Red Mountain: Lord Indoril Nerevar. Vivec was his lieutenant, Almalexia was his queen, and Sotha Sil was his wizardly adviser. The cult also believes that, in the end, Nerevar will return in a new incarnation (the Nerevarine or Incarnate) to reunite the Dunmer and bring down the gods they see to be false.
The cult's most prevalent belief is that the Tribunal morally betrayed Nerevar by going against his dying wishes and advice to take the power of the false Dwemer god, which drew its power from an artifact of ultimate evil. Because of their actions, all the good that they do with their stolen power will eventually be undone or corrupted and they are doomed to weaken and fail over time. Dagoth Ur, however, will become stronger because he uses the same stolen powers for evil.
There are rumors that the Tribunal may have betrayed Nerevar in a greater way by directly backstabbing him themselves to seize the power of Akulakhan. There is no evidence to either support or falsify this rumor, but it is supported by House Dagoth, the rising Sixth House. This is perhaps done in the hope of winning the support of disaffected Dunmer and turning the Nerevarine Cult itself to their support. Fortunately, the Sixth house has not succeeded yet: Dagoth Ur is still viewed as the enemy, by the Nerevarine Cult, as much as by the Tribunal Temple.
It is also unclear whether Nerevar's fatal wound was received in his battle against the Dwemer king Dumac, in a subsequent battle against Dagoth Ur, or at the hands of the Tribunal. According to some versions of the history, Dagoth Ur (or Lord Voryn Dagoth, as he was then) stood alongside the Dwemer at the Battle of Red Mountain and betrayed the Chimer under Nerevar during that battle. A more reliable version of the story is that Dagoth Ur fought alongside Nerevar and stole the power of Akulakhan later. Most Dunmer traditions claim that Nerevar and Dagoth came to blows and Nerevar was the victor, though seriously wounded. Some believe that the Tribunal then finished him off; others believe that, for whatever reason, they simply failed to heal him. Whatever the case, Nerevar died at this time. The Tribunal learned how to use Kagrenac's Tools on the Heart of Lorkhan, to steal its divine essence for themselves.
Others who support the Nerevarine Cult believe in throwing the Empire and all foreigners out of Morrowind entirely, whatever the cost. They see a reborn Nerevar as a leader to unite the Dunmer against foreign foes: the thought that the Nerevarine might be a foreigner has not occurred to them, nor have they thought about what this might portend (i.e. that the true enemy is the evil within, not the enemy outside). Fortunately, the Urshilaku are willing to accept this change of interpretation.