Ooooh - prevarication bob
You have just reclaimed your position re Vivec = your Vivec!
And to keep Vivec dead does not actually satisfy anyone except those who insist that they killed Vivec and just because he vas a god with powers beyond mortal comprehension gives no possibility he survived.
It never occured to such thinkers that they might have fought a simulacrum of Vivec? Or an imposter? After all who introduced you to Vivec?
Well they are entitle to insist that they play in such an outcome fo rthemselves, but I DID NOT KILL VIVEC - SO I INSIST HE IS ALIVE!
Cor! Don'y I shout loudly?
There is only one way forward that can satisfy all semi-reasonable players - a quest that can establish either:
- the killing of Vivec by the Nerevarine or
- the continuing existance of Vivec.
With both options possible and scripts that support the different sets of outcomes and ongoing changes in the world that differ for either, including the possibility of seeing the dead body of Vivec or meeting the live Vivec and interacting with him.
The Emissary could be one route to achieve this. He/she could be Vivec or lead the player to Vivec's corpse.
Lost Godhood?
You insist that Vivec lost his godhood, but I think that if you read the Apochrypha then you would have seen that Vivec saw a sort of demi-god-hood for himself, and the intention to remain in the background and re-establish something more on the Ancient lines with Saints being the focus of belief.
What must be considered is the nature of the shrines ... here's my little theorie - they were mechanical artifacts that drew on belief and actions to turn the substance and spirit into a source of mana an dthen apply that in a new way according to whatever power/spell they were inbued with.
So when you pray to a Saint you receive that spell - despite the fact that the Saints were dead and did not manifest ... unlike the Tribunal members
And I wonder if they were Dwemer inventions? Or from what source both the Dunmer and Dwemer go them?
If this is true then maybe Vivec misled the player about the waining of the power of the Tribunal - so long as people go to pray at the Shrines he will receive a portion of power from their belief ... and maybe thus he inherited the power from the dead Tribunal members. That might make him stronger than ever.
Hows about the Heart was corrupt and was holding the Tribunal in thrall along with Dagoth Ur? Dagoth Ur was so power-hungry and sick that he could not see this. In this case Vivec would be desperate to be freed ... and maybe Azura saw his impending escape and moved to attempt to assassinate him before he could escape her wrath also?
Thus the Tools of Kagrenac that we have been told corrupted the Heart or the Power of the Heart may have done no such thing. They may have been draining to the user, but that is another matter ...
Then what Azura might have feared could be the power of the corrupt Heart Itself overwhelming Tamriel and even entering in to Oblivion, or her fellow Princes or th e9 discovering thetruth of the nature ofthe Heart andattempting to makeuse of it. In any case she would have lost worshippers if the corruption became so widespread, or universal ...
But this would need to be the subject of several Books an da lot of questing and discovery ... and whatever the player found or came to believe might still be a pack of lies that some being more powerful than the player placed there for serious reasons, or merely out of caprice
I will leave you with one last delicious thought. What if the real mature of the Heart was that, in order to become invulnerable to certain forms of attack, Azura placed Her own Heart in the Mountain, and the Dwemer's and the Tribunal's interference with it enraged and terrified Her?
The only way to safeguard it was to have it sent back to Oblivion and maybe then send it somewhere else. And that was accomplished by killing it?