User blog comment:B214/Shin DxD 1 discussion/@comment-79.25.64.21-20180813153423/@comment-79.25.64.21-20180813224650

I know what nereids are, but every sacred gear, even with different powers, always had a connection between them. The ability to weaken, control or empower dragons by singing how can be related to the ability to control the oceans?