Board Thread:Theories & Speculation/@comment-1512913-20141028151348/@comment-3279282-20141101200326

Kaguya's Dojutsu was called Kekkei Mora.

And a little bit information from page 17 :

"The 'Yotsuki Clan', that's inhabitating the Unraikyo since generations. They approved the First Raikage, and gave away their land."