This isn't quite the whole song but I worked out the intro, verse and chorus parts. 
that I'm a bit stuck but will keep working on it.

Listen to the song to get the timing right, I haven't really shown how it's timed, just 
notes played.

* Natural harmonic
. Palm mute
.- Palm mute on 2 digit note (e.g 10 with .- underneath means single muted note on 10th 
10 with .. underneath means two separate muted notes; first on the 1st fret then on the 
fret.)
/ Slide up
\ Slide down
h Hammer on


_____________________________________________
Intro Part 1 (Play through twice)

D|-----------------------------------------|
A|-----------------------------------------|
F|----8-------------8----------------------|
C|---------0-------------0-----------------|
G|------6-------------6--------------------|
C|---------------------------0-------------|

D|-----------------------------------------|
A|-----------------------------------------|
F|----8-------------8----------------------|
C|---------0-------------0-----------------|
G|------6-------------6--------------------|
C|---------------------------7-------------|
                             *
D|-----------------------------------------|
A|-----------------------------------------|
F|----8-------------8----------------------|
C|---------0-------------0-----------------|
G|------6-------------6--------------------|
C|---------------------------0-------------|

D|-----------------------------------------|
A|-----------------------------------------|
F|----8-------------8----------------------|
C|---------0-------------0-----------------|
G|------6-------------6--------------------|
C|---------------------------5-------------|
                             *

_____________________________________________
Intro Part 2

D|-----------------------------------------|
A|-----------------------------------------|
F|----8-------------8----------------------|
C|--------7-5---7------7-5---7-------------|
G|------6-5-3---5----6-5-3---5-------------|
C|--------0---0---0----0---0---0-----------|
              .   .        .   .

D|-----------------------------------------|
A|-----------------------------------------|
F|----8------------------------------------|
C|--------7-5---7---8---7---5---7----------|
G|------6-5-3---5---6---5---3---5----------|
C|--------0---0---0---0---0---0---0--------|
              .   .   .   .   .   .

______________________________________________
Intro Part 3

D|-----------------------------------------|
A|-----------------------------------------|
F|----10------9-7---10------7-9------------|
C|---------0-------------0-----------------|
G|------8-------------8--------------------|
C|-----------------------------------------|
                                              x2

______________________________________________
Main Verse (Continuous palm muted alternate picking)

D|-----------------------------------------|
A|-----------------------------------------|
F|-----------------------------------------|
C|----------------11-----------------------|
G|----33------33----------33---------------|
C|------111111--11--111111--11-------------|
      ........................                x2

D|-----------------------------------------|
A|-----------------------------------------|
F|-----------------------------------------|
C|----------------11-----------------------|
G|----22------22----------22---------------|
C|------000000--00--000000--00-------------|
      ........................                x2

D|-----------------------------------------|
A|-----------------------------------------|
F|-----------------------------------------|
C|----------------11-----------------------|
G|----33------33----------33---------------|
C|------111111--11--111111--11-------------|
      ........................                x2

D|-----------------------------------------|
A|-----------------------------------------|
F|-----------------------------------------|
C|----------------11-----------------------|
G|----22------22----------22---------------|
C|------000000--00--000000--00-------------|
      ........................                x2

______________________________________________
Pre-chorus (Continuous palm muted alternate picking)

D|-----------------------------------------|
A|-----------------------------------------|
F|-----------------------------------------|
C|-----------------------------------------|
G|----1010----77----1010----77-------------|
C|--------8877--8800----8877--8800---------|
      .-.-...........-.-..........            x2

D|-----------------------------------------|
A|-----------------------------------------|
F|-----------------------------------------|
C|-----------------------------------------|
G|----88--------5588--------55-------------|
C|------88775577----88775577---------------|
      ........................                x2

D|-----------------------------------------|
A|-----------------------------------------|
F|-----------------------------------------|
C|-----------------------------------------|
G|----1010----77----1010----77-------------|
C|--------8877--8800----8877--8800---------|
      .-.-...........-.-..........            x2

D|-----------------------------------------|
A|-----------------------------------------|
F|-----------------------------------------|
C|-----------------------------------------|
G|----88--------5588--------55-------------|
C|------88775577----88775577---------------|
      ........................                x2

______________________________________________
Chorus

D|---------------------------------------------|
A|---------------------------------------------|
F|----12-12-12-12-----12-12-12-12--------------|
C|----10-10-10-10-----10-10-10-10-----7h10-7---|
G|----8--8--8--8--0-0-8--8--8--8--7h8--------8-|
C|----------------0-0--------------------------|
                  . .

D|---------------------------------------------|
A|---------------------------------------------|
F|----9--9--9--9------9--9--9--9---------------|
C|----7--7--7--7------7--7--7--7---------------|
G|----7--7--7--7--7-7-7--7--7--7------7\5-5h7--|
C|----7--7--7--7--7-7-7--7--7--7--7h8----------|
                  . .

D|---------------------------------------------|
A|---------------------------------------------|
F|----12-12-12-12-----12-12-12-12--------------|
C|----10-10-10-10-----10-10-10-10-----7h10-7---|
G|----8--8--8--8--0-0-8--8--8--8--7h8--------8-|
C|----------------0-0--------------------------|
                  . .

D|---------------------------------------------|
A|---------------------------------------------|
F|----9--9--9--9------9--9--9--9---------------|
C|----7--7--7--7------7--7--7--7---------------|
G|----7--7--7--7--7-7-7--7--7--7------7\5-5h7--|
C|----7--7--7--7--7-7-7--7--7--7--7h8----------|
                  . .

D|---------------------------------------------|
A|---------------------------------------------|
F|----7--7--7--7------7--7--7--7---------------|
C|----5--5--5--5------5--5--5--5---------------|
G|----5--5--5--5--5-5-5--5--5--5------5\3-3h5--|
C|----5--5--5--5--5-5-5--5--5--5--5h6----------|
                  . .

______________________________________________
Now repeat as follows:

Main Verse
Pre-chorus
Chorus x2

This is where I get stuck. I'm going to keep working on it so if I get anywhere I'll update.

Enjoy,
Gawain.