darkness

#FF0000 ">It's coming for you #FF0000 ">--
the quick but moveless beast#FF0000 ">,
like a hand grab#FF0000 ">bing your soul
it pulls you to the other side
#FF0000 ">of the the darkness.
#FF0000 ">Your world becomes nothing more then a#FF0000 ">n empty void
with nothing but black walls and shadow#FF0000 ">s watching your every move#FF0000 ">.
#FF0000 ">You are trap#FF0000 ">ped like a mouse in a cage,
with #FF0000 ">nowhereto go
trap#FF0000 ">ped from the light#FF0000 ">--
the golden light
which you shall never see again.

I'm guessing that you're not a native speaker. If so, I should explain the corrections I've made.

First of all, I wrote "it's coming" because you are describing an action which takes place right now, as you write your poem/as others read them.

Then you have "other side the darkness", which needs a connector there to show what the relation between the words. I assume you wanted to write about the other side of the darkness.

After that, you have two verbs "grabbing" and "trapping". Well, you need a double letter there. In the case of the verbs ended in "p" and "b" the final letter gets doubled.

Well, and that kind of sums it up.

Hello! I'm Jojo and i shall be your reviewer for today!
Here we go-
Grammar is in #FF0000 ">red.
Others are in #0000FF ">blue.

#FF0000 ">It #FF0000 ">come? for you- #FF0000 ">that is grammatically incorrect. Try"came" or "it's coming"
the #0000FF ">quick but #FF0000 ">moveless-motionless #0000FF ">beast- #FF0000 ">"moveless" is not a word.#0000FF ">( quick but motionless doesn't really add up... what are you trying to say?)
like a hand #FF4000 ">grabbing your soul#FF0000 ">,(comma)
it pulls you to the other side
#0000FF ">(of)the darkness.
#FF0000 ">Your world becomes nothing more #FF0000 ">than a empty void#FF0000 ">,(comma)
with nothing but black walls and #FF0000 ">shadows watching your every move#FF0000 ">.(period)
#FF0000 ">You are #FF0000 ">trapped like a mouse in a cage,
with no were to go#FF0000 ">;(semicolon)
#FF0000 ">trapped from the light#FF0000 ">,(comma)
the golden light
#0000FF ">which you shall never see again.- #0000FF ">that's seems sort of incomplete, if you ask me. I think you should change it to "That you may..."

Now, with all of the edits...

It's coming for you
the quick but motionless beast
like a hand grabbing your soul,
it pulls you to the other side
of the darkness.
Your world becomes nothing more than a empty void,
with nothing but black walls and shadows watching your every move.
You are trapped like a mouse in a cage,
with no were to go;
trapped from the light,
the golden light
that you may never see again.

Overall:
I love the concept and story you have here, but the overall grammatical flaws are really distracting. You need to add more punctuations and try to do a spell check, because you missed a few simple letters.
Also, ensure that your use of tense is constant, and add more detail to keep the reader interested.
other than that, nice job!

Keep writing!
---------------------------
-Jojo