How is it that if the Heart of Lorkhan was destroyed, there would be no world anymore? Nirn was there before Lorkhan's heart blew out of his chest and into the planet. So how is it tied to the existence of the Mundus?
I'm sure there are a few more informed people out there, so let me say I am a tad curious considering the deactivation of the Heart as well. That said, I'll give my current understanding, and see how that holds up.
Alright, from what I've heard, the Heart wasn't destroyed, per se, simply deactivated by the tools of Kagrenac. I believe it returned to its original state (whether that means it is returning to Lorkhan or simply back to how it was before the Dwemer used it I'm not sure), taking away the Tribunal's powers and potentially impacting the Dwemer (whatever happened to them).
The thing was, before Lorkhan's Heart was shot into Morrowind, things were a bit screwy. The main thing is, the Heart allowed Nirn to maintain stable even without the presence of the Aedra. Akatosh stabilized time, the Zero Tower started the Convention, and the Heart allowed Nirn to exist without the divine. It was the divine spark on Mundus, so without it things would be bad.
So, the Heart's not gone entirely, and it is important to Mundus. Without it Nirn would be in considerable trouble. But like I said, I've only heard about it a few times, I'm just as anxious for an answer as you
EDIT:
You understand correctly, so does Darkom.
Aw, I got so excited when I saw Jack had posted, I thought I might learn something new. Turns out I was correct, at least partly; how mundane. Oh well, at least I have been more or less confirmed.
Any other thoughts on the subject that I most likely missed? The more I have stored away the better I can speculate, and speculating is just so much fun