The Waterfall Slicer is the pride of Hiden, an ultimate treasure said to have cut a waterfall in front of the king. It belonged to Kodwar, the strongest hero of his time, who died at the Mineshaft of Elbe about three hundred years ago. Jazhak and Vroko both failed to recover it.
Alicia dove to the bottom of the flooded mine in a barrel and pulled it from the head of a sleeping ancient beast, asking the sword to let her hear its voice. When it slices water cleanly the wielder can run across water, tilting the blade creates propulsion, and it is even stronger underwater. Clevatess considers that living creatures are mostly water, so with his advice Alicia used it to cut down Meynard’s entire insect swarm with the Flowing Water Slash.
Clevatess confiscated the sword and kept it in his shadow, returning it at key moments: at Shiron, against Drel (the “Rising Waterfall”) and at the end of the Solsein arc.