E|--------------------|
B|--------------------|
G|------------------0-|
D|--5-3---5-3---5-3---|
A|6-----6-----3-------|
E|--------------------|


I think at some points the riff changes to this, maybe during all of the verses, but I'm 
100% sure about that.

E|------------------------|
B|------------------------|
G|------------------------|
D|--5-3---5-3---5-3---5-3-|
A|6-----6-----3-----3-----|
E|------------------------|

And these are the chords played during the chorus(it's not really a chorus but the part 
it gets intense)...

E|------------|
B|------------|
G|5----8------|
D|5----8----5-|
A|3----6----5-|
E|----------3-|

and this is played during this part also, I think it's just tremolo picked.
It's played throughout most of the song as well but it is much louder during the chorus.

E|--------|
B|--------|
G|--------|
D|---5----|
A|--------|
E|--------|