WAIT.
Uh.. since he's the spirit king of water, can't he use the water to make like.. water bubbles to drown the enemies?
(I learned this from another manga, forgot where lmao).
Cause, like, it's possible..
Or yeah, icicles to throw, like the comment said below.
ANYWAYS! Practice makes perfect, Isana/Rai. So I'm sure if you keep it up, you'll be fine! Just take breaks from time to time. Don't overwork lol