How could Turin return?

[*Varda*]

Correct me if I'm wrong, but didn't all men go to the Halls of Mandos after their death? Well, including the elves that died too. And there they waited until the Final Battle and so on? Correct me if I'm wrong, because I haven't actually read that part.

I do like the idea of the Dagor Dagorath, the Final Battle. And that Turin slays Morgoth, because, to be honest, he didn't exactly have the best life, marrying his sister by accident.

Also, where is the quote that says Turin and Nienor became Valar? I just can't envision this happening.

I don't think Sauron's defeat can really be compared to Morgoth's defeat. Sauron, after all, was a lesser being than Morgoth, he being a Maia and Morgoth a Vala. Also, he poured so much of his energy and life into the Ring, that when it was destroyed his spirit probably collapsed.

Whereas, with Morgoth...the most I can see happening is him being cast back into the Void for another 5 ages...but everything would be different by the Final Battle.