I cast with the color of water to create beauty,
A blossom made of pureness is one ingredient.
I chant a spell, using the blood of a Sahagin,
At a mountain root, I call upon a dragon.
I cast with the northwestern wind,
A ray of hope in the surrounding darkness.
I use my book, you know my name,
In this world, I am not seen whatsoever.

This is a bit different, I'm looking for something that the answer(s) have in common. And I also want where most of this is from.