This is The Beast from the Far lands of Snow.
Soon, he will have his Own "Creepy Pasta"

Took me Record time (As I am a SLOW shader) of 7.5 Hours!

The Darkened or as I call it "Dawn's Nightmare" http://imgur.com/aQQzkW4
(As Suggested to do by NateIsBetter)

This is like the Big Foot/Yeti of Minecraft, been looked for since InfDev, like Herobrine's brother.
Say, I even made a Poem for him!

Sorrowful Life

Oh, Spirit

Laid rest on the softly swaying grass,
The Sky turned Gray, the soft clouds past.

Lay your head spirit, For you have reached Death

The exhausted people lost it all,
As their eyes, too, began to Close.

For the Beast is coming, every man has secrets
Every man had demons, but rest of weary, Spirit

Your days of Exhaustion are done.
No more times of being tired.
No more wake and work, you're no longer Wired

Sleep well, of weary Spirit, for the clouds have turned Gray,
the Moon replaced the Sun, as night replaced Day

Here's the Concept Picture:

http://imgur.com/QjHNF1m