Board Thread:Lore Discussion/@comment-31283382-20131208231524/@comment-86.88.195.218-20160330215123

who said the heart was destroyed? Lorkhan is the missing god. The heart is missing. Nurn would unravel without its heart. So it can't be destroyed.

To further back this up, Azura says in the ending: 'The God's Heart freed...'

Make of that what you will.