User blog comment:B214/Shin DxD 1 discussion/@comment-79.25.64.21-20180813153423/@comment-30924344-20180814172214

Nereid Kyrie's two powers are Dragon control and water control. The Japanese wiki confirms it. Also Nereid's other name has "ocean" in it. Here is the kanji: 終わる翠緑海の詠. This kanji says it's abilities are dragon + water control: ドラゴンに影響を与える歌声と海を操る力という2つの特性を持つ