User blog comment:B214/Question and Answers 6/@comment-185.112.105.215-20171205122857/@comment-24595619-20171208055949

In terms of control [Technique], Sona is higher than Rias who is a primarily a [Power]-Type attacker, but Rias is higher than her possibly in terms of demonic-power in general. I don't know there was barely any story time for Sona and her peerage.