Sona's Leviathan

Eventually, a countless number of water beasts completely surrounded Xenovia. The beasts which Sona-senpai controlled were not limited to simple movements such as charging ahead. Each and every one of them were products of intricate demonic energy control which could alter their movements according to Xenovia’s attacks. Since some of the beasts even used feints, Xenovia was constantly at her wits’ end. The water dragon Leviathan also expelled powerful stakes of compressed water from its mouth, and the vast number of those sharp water stakes stabbed into the area where they were fighting. The trees, ground and rocks were all pierced through by them with ease. Without any armor, Xenovia would not last long if she took a direct hit.

...So Sona-senpai was also capable of using such powerful attacks to cover a wide area. Moreover, since the only constituent required is water, so long as her demonic energy wasn’t exhausted and there’s water present, she was capable of doing almost anything. Even if her water forms were destroyed by Xenovia’s Holy Sword, she could easily give shape to the water and attack again. Sona-senpai’s level of demonic energy control with water was so precise that everyone in the viewing room was left speechless. But even under such circumstances, Xenovia panted as she asked Sona-senpai.

Volume DX 4, Final Line