Ok this song is mainly comprised of one riff with a slight variation each time.

Drop D Tuning

Intro:

e|------------------------------------|
B|------------------------------------|
G|------------------------------------|
D|------------------------------------|
A|3-5-3-5--3-5-3-5--3-5-3-5--3-5-3-5--|
D|------------------------------------|

Hold every second 5 slightly longer.

After this plays for a few bars it changes to:

e|-----------------|
B|-----------------|
G|-----------------|
D|---------3-5-----|
A|3-5-3-5------3-5-|
D|-----------------|

You play this riff through the whole verse.

We then hit the chorus:

e|------------------------------------|
B|------------------------------------|
G|------------------------------------|
D|55555555-33333333----------3-5------|
A|55555555-33333333-3-5-3-5------3-5--|
D|55555555-33333333-------------------|

e|---------------------------------------------|
B|---------------------------------------------|
G|---------------------------------------------|
D|55555555-33333333---------------3-5----------|
A|55555555-33333333-3-5-3-5-00000-----3-5---00-|
D|55555555-33333333---------00000-----------00-|

Palm mute all the zeros to get that chugging sound. Listen to the song to get the rhythm.

That's really it! There's a few high pitched sounds that I believe are synths but if 
works them out feel free to PM me the correction and I'll add it in.

Enjoy!