OVERVIEW:
         The language in this piece is, indeed, very beautiful. However, I don't get the purpose of formatting it as prose. Not to mention saying something is written in prose doesn't tell me much about your intentions for the piece. Is it supposed to be a story? Is it a poem without a metric structure? If it's the former it lacks in all the elements of a such as plot or character development. If it's the latter, then I think it's better off as a regular poem. There's no benefit it formatting it prosaically.
         The language is very nice. Your word choice carries a lot of emotional impact. While there may not be any strict metric structure applied to the piece it still has a nice cadence and rhythm. However, I did find a couple sentences unwieldy;
Traveling through the sea, waters crashing and rushing around, this one just lacks a subject and feels incomplete.
Knowing my fate is in that cry but I can not find them, I'm not sure why this one throws me off again it just feels incomplete.
I do really like the alliteration in regards to the dark soul in the first paragraph.

In conclusion, I think this is a wonderful piece, but your formatting choice may do it more harm than good.

SPELLING and GRAMMAR:
Traveling through the sea, waters crashing and rushing around.

Echoes of them are deep in the depths of my dark soul that's been forsaken many times in the chase for the sea to become settled.

There lies a familiar cry that enchants my mind.
There lies familiar cries that enchants my mind.

The Calling of the Sirens will be my undoing.

Knowing my fate is in that cry, but I can not find them.