User blog comment:Zippertrain85/The reasons why Serana is not from the First Era./@comment-26474238-20130514055034/@comment-9062114-20130514064014

Interesting point. I know that the stone is a white like color, most Nordic ruins are made of darker stones. Stone could also be challenging to make to masterful levels based off of the Nordic ruins. If they had the technology to use it, why wouldn't they?