This forum doesn't allow me to put a link on it so I have to say:

copy "The great house dagoth mod morrowind" in to the search bar of google and the first result should be "Great House Dagoth - Planet Elder Scrolls - GameSpy"

THEN JUST DOWNLOAD AND PLAY IT YOU FETCHERS!

Ooooooh nice I really do need to finish Morrowind's storyline. Didn't manage to before Online's release.

I did play a mod similar to this for Oblivion where you could join the Mythic Dawn after beating the main quest but it was kinda over-the-top evil and really cheesy. Go figure.

YES FINISH MORROWIND!
The Great House Dagoth mod is fun, though the ending is somehow weird, I like it in general. It almost made me ship Nerevar/Dagoth Ur. But no, Nerevar belongs to all of his loyal followers lol
The joining Mysthic Dawn mod sounds interesting. I might try it sometime later. But I don't like Mythic Dawn that much. They are basically pure villain, not like Dagoth.

I tried morrowind but I got lost 10 minutes in

Once I realized that stamina affects basically everything in the game it became really fun. No fast travel is weird to get used to but if you can find a mages guild they'll teleport you to lots of the main cities for cheap. And silt striders are cooool, really wish they were in ESO.