Step #78 in the Expanded Vanilla list
SammyB27 and Revised by Caeris
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Dagoth Ur has been defeated, but the continued presence of the Sixth House still poses a threat to Morrowind. A lieutenant of the Tribe Unmourned has come out of the shadows in a sinister plot to resurrect Dagoth Ur. But hope is not lost, a new Spymaster for the Blades has arrived in Ebonheart, here to help the Nerevarine in his new struggle.
I didn't finish these quests so I'm not sure if there are any compatibility issues. I did, however, get several missions in with no issues.
The Rise of the Tribe Unmourned.esp