Board Thread:General Discussion/@comment-27202617-20151124221524/@comment-6881629-20151125105941

The Elder Scroll is used to see back in time to learn the lost shout Dragonrend, to get to Sovngarde you use the portal at Skuldafn. Alduin might not be permanently defeated as Arngeir says if you ask him if about it afterwards...

"Perhaps, perhaps not. Dragons are not like normal mortal creatures, and Alduin is unique even among dragonkind. He may be permitted to return at the end of time to fulfill his destiny as the World-Eater. But that is for the Gods to decide."