I guess you are not immoartal/invincible after becoming Sheo in SI because the PC is not familiar with the skills and his powers, so he can still be killed. But that is just a way to explain this point

SI is a pretty big example of this actually happening but without going into spoiler land that was a replacement rather than becoming a completely new one. I don't think the other Daedric gods would like a new member coming to the plate. But you never know, there may be more that we have not heard of knocking about somewhere.

Maybe there are other Princes we may see in the future. Lately Bethesda have been pretty liberal with there interpretation of the lore so who knows? We may be seeing something new. But I don't think you'll see a mortal becoming a Daedric Prince.

Lorkhan's Heart wasn't destroyed by the Nerevarine, it was merely "displaced". Septimus Signus alludes to this during the Oghma Infinium quest in Skyrim. I think Vivec also said something along the lines of that, how he doubted it could truly be destroyed, seeing as how it was a piece of divinity itself.
How much you bet that [censored] Vivec went searching for the Heart of Lorkhan again so he could reattain godhood? After the events at the Trial of Vivec, i'd bet Azura sent the Nerevarine to hunt down and kill Vivec.

So Auriels bow was the same bow to fire Lorkhans heart?

It happens, although rarely. Becomming a daedric prince (it's more like merging really, no one really knows how much of the 'you' of you remains afterwards though) usually involves the same process that becomming an aedra involves. What happened in the SI could be done with an aedra or another daedra (the circumstances and events would have to be drastically different, and heavily relate to the god in question).



If you take the Trial of Vivec as truely canon (hate that word, and I do take it that way), then Vivec has already retained and surpassed his previous godhood.

He didn't need to, CHIM.

If Vivec had truly attained CHIM, he wouldn't need the Heart of Lorkhan at all. He needed it, so he didn't have CHIM.

Champion of Cyrodiil did, though obviously given HOW he become a Daedra, repeating this process is severely unlikely.

Where does is specifically state that he 'needs' the heart? It is stated however that he learnt CHIM, from Molag Bal and implied that he knows it in the Trial.

Uh, the entirety of Morrowind? The tribunal was losing power containing Dagoth Ur because they couldn't get to the heart.

And yet Vehk could still hold Lie Rock above Vivec and presumably hold about 50% of the Ghostfence up (considering Seht's absence) impressive for someone losing their power.

If he were truely reliant on only the heart, Baar Dau would've fallen immediately when the Nerevaraine disconnected ALMSIVI and Dagoth Ur from the Heart.

Edit - Beaten to the punch by Athell, dat ninja.

Yeah but the game still mentions that he's become a recluse due to the endeavor, having to meditate privately to hold the ghost wall which is failing.

Let's face it, if Vivec had CHIM he could just say that Dagoth Ur doesn't exist and that'd be that. He also wouldnt have to worry about dying, because there is no death if you are one with everything. Yet he mentions to the Nerevarine that it's likely that he (the Nerevarine) will kill him (Vivec) after all is said and done.

And lo, the Ministry did fall...

But where's the fun in that? He does speak about death though, if I could find the exact quote I would but he speaks about a timeless space, he tried waiting there for what felt like ages and when he returned time had not moved on. Death don't mean as much dat kid.

Later, if he was dependent on the Heart the instant it was released the Ministry would have fallen.

I'm not saying the guy wasn't a demi god. the heart of lorkhan gives a lot of power. I'm saying that he required the heart of lorkhan. Elsewise the Tribunal wouldn't have returned repeatedly and went nuts when Dagoth denied their feeding this last time. CHIM doesn't require a power source because you recognize that you're one with everything and everything is a god's dream, so you are god.

If you were god, you wouldn't need a power source and the Nerevarine wouldn't be able to kill you. Not only is it canon that this is what happens, but I killed Vivec in game anyway.

As for the Ministry floating, well enchantments wear out eventually if they're not recharged. You could enchant a weapon and die, but that doesn't wear the enchantment out immediately. Use of the enchantment wears it out.

CHIM is realizing you are part of the dream and accepting it, only Amaranth exists beyond it.

There's nothing saying that that death was permanent. If he was so accepting of the fact he was going to be killed by the Nerevarine why didn't he just leave? Perhaps because he knew that no death would last for long or perhaps he just wanted to bathe in pico-filament moltings that come in six beautiful colors the Aurbis hasn’t even revealed yet.

But it wasn't an enchantment as such, he merely commanded it to stop. An enchantment requires a soul and soul gem neither of which were used.

Also Vehk dying isn't canon, he disappeared. He could have been killed, he could have been taken by the Daedra or he could have just left.

Occam's razor.

Auriel's Bow required a soul too, then?

I'm not sure you can apply Occam's razor to a hermaphroditic god who killed his friend and leader to steal the godhood from the heart of a dead god.
Auriel's Bow is a special case, as is Lie Rock but they are different cases. A parallel cannot be drawn.
From the Lessons of Vivec. Sermon 33.

I was saying you were drawing way more assumptions than I was. Everything in the game suggests that Nerevar(ine) and Azura will have their revenge on Vivec and he's accepted that it's going to happen. You're drawing up a bunch of unsubstantiated claims that aren't alluded to anywhere.

Based on what? They both used magic.

This still doesn't say anything in detail. Everything we know about items that have magical effects in the Elder Scrolls is that they're enchanted. We never see any examples that prove the opposite.

Vivec and the Tribunal defied Azura because they thought themselves gods. If they truly had achieved CHIM they wouldn't have allowed her prophecy to come into fruition because it would mean the end of their reign as gods.

They couldn't stop it.

Note that the only character suggested to have achieved CHIM is also the most powerful character in Elder Scrolls canon - Talos. (Link to this fact here.) http://www.imperial-library.info/content/forum-archives-michael-kirkbride

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I think it's time to agree to disagree. Personally I think that Vivec achieve CHIM, you don't. Neither of us are going to change our minds and we can both walk away now with our dignity intact.

Champion of Cyrodiil -> Sheogorath/Daedric Prince...

It could be argued that the Champion mantling/becoming/being taken over by Sheogorath is an exception precisely because we're talking about Sheogorath. The Madgod, the one who breaks the rules.
A mortal becoming a daedra, let alone a Prince? That's crazy!