So, at a certain point you go to the Obvious Water Walking Teaching Place as part of the main quest, and learn waterwalking.
That's fine.
THEN again during the main quest, at lvl 60 you unlock the SErn island with 3 caves and a tower, and YOU LEARN WATERWALKING AGAIN.
Nonsense.

Also, the "Royal Arts" are not listed, only the lastest is shown. That's like hiding my trophies.