I'm in the heart chamber. I can get across the bridge. Where is the heart? I know it's here somewhere. What does it look like?

It looks like... http://images.uesp.net//1/13/Heart_of_Lorkhan.jpg

I swear it wasn't there the first three times I got killed. Then I looked at your picture and there it was when I looked again 2 minutes later. Hooray, now I can play Bloodmoon without having to feel guilty about leaving Vaardenfel to its fate....