User blog comment:B214/Shin DxD 1 discussion/@comment-79.25.64.21-20180813153423/@comment-31137559-20180813201554

Pretty sure controlling the ocean was an ability of Nereid Kyrie. Well better to wait for the volume to be translated.

Well all of the descendants of the Maou are blessed with large amounts of demonic power as we've seen with Katarea fighting on par with Azazel in Volume 4.

We really don't know how much demonic power Vali has exactly. It could be no higher than Shalba's. Remember that Vali also has Divine Dividing as well on top of his demonic power.