So based on Karl and sidekick's appearance I'm guessing that MC and fox girl will have to finish the seal so Deathwing can be dry-aged to death finally.
Why do they keep talking about lead (the metal)? Am I being led to believe the teleportation turned him into lead, leading to them saying he is lead there? I suppose that is one way to take the lead in the conversation.
So, they used an elder scroll to trap Baltduin, the World-Eater, in time. But Baltduin will return and Lindoborn will need to face it for one last time.