User blog comment:Bato of the Heavy Iron Rock Hammer/A thirteenth member of the Spriggan Twelve/@comment-24367018-20150721183334/@comment-24102956-20150721185103

Well, if the original twelfth member is kicked out then God Serena took his/her place.

The possibility of a 13th member is just hiding in the shadows with no small hints of appearance, leaving an impression that they're the Spriggan Twelve.