Cold

[Versify]

Edit.1
On castle stone-bricks dull and old - I like this intro, it brings you to a rather ancient and spooky setting
felt the shadows very cold. - I was thinking of giving the shadows a source... such as Laid _(ancient?)_ shadows, null and cold

Then they opened nearby door - This line could be more descrptive, whom? and why is the action opened?
it got colder even more. - I was thinking of maybe taking more and replacing it with before or possibly war since we are in a medieval setting
All the warmness was winds prey,
so the shadows ran away. maybe make shadows an indirect object of the wind such as "chasing the shadows"

I still like the idea, its short but like a picture could be saying a thousand words... so they say. But those are just some suggestions, keep at it though.