i think its in drop c

d|
A|
F|
C|
G|
C|

let the notes ring out and repeat a few times, while the other guitar does the open chugs
x2
d|-0-0-
A|-5-4-
F|-----
C|-----
G|-----
C|-----

then alternate the notes
x4
d|---0---0------0---0---|
A|-5---5---5--4---4---4-|
F|----------------------|
C|----------------------|
G|----------------------|
C|----------------------|

do this a few times except dont do the little slide the second time the riff is done, 
add the slides again
x5
d|---------------------|
A|---------------------|
F|---------------------|
C|---------------------|
G|----8-7--5-3---------|
C|-000-0-00-0-00-3/5\3-|
   *** * ** * **

it might look a little confusing but its just a galloping beat, you just gotta feel it haha
x4
d|-------------------------------|
A|-------------------------------|
F|-------------------------------|
C|-0-----------------------------|
G|-0-000-000-000-000-000-0-------|
C|-0-000-000-000-000-000-0-3/5\3-|
     *** *** *** *** *** *

just bend up a little bit and then pull off to 0
x4
d|------------------------------------|
A|------------------------------------|
F|------------------------------------|
C|------------------------------------|
G|------------------000-000-000-000-0-|
C|-0-7bp0-5bp0-5bp0-000-000-000-000-0-|
                    *** *** *** *** *

d|------------------|
A|------------------|
F|-9~---------------|
C|-9~-x4------------|
G|-7~----slide down-|
C|------------------|

twice
d|-----------------------------------------|
A|-----------------------------------------|
F|-99-9-9--9-77-7-7--7-44-4-4--4-55-5-5--5-|
C|-99-9-9--9-77-7-7--7-44-4-4--4-55-5-5--5-|
G|-77-7-7--7-55-5-5--5-22-2-2--2-33-3-3--3-|
C|-----------------------------------------|

verse is done 2 more times but with a little switcharoo
d|-----------------------------------------------------|
A|-----------------------------------------------------|
F|-99-9-9--9-1111-11-11-11-1212-12-12--12-14~-14-12-11-|
C|-99-9-9--9-1111-11-11-11-1212-12-12--12-14~-14-12-11-|
G|-77-7-7--7-9-9--9--9--9--1010-10-10--10-12~-12-10-9--|
C|-----------------------------------------------------|

repeat the top until you get to the hold on the 12th fret power/octave chord and instead 
to the hold on the 14th fret
d|--------------|
A|--------------|
F|-16~-16-14-12-|
C|-16~-16-14-12-|
G|-14~-14-12-10-|
C|--------------|

then theres like a bridge between "its not over yet" its strummed lightly
d|-----------------|
A|-----------------|
F|-----------------|
C|-----------------|
G|-----------------|
C|-0-0-0-0-0-0-0-0-|
   * * * * * * * *

now for the breakdown and repeat multiple times

im not sure if the breakdown is like this...
d|----------------------------|
A|----------------------------|
F|----------------------------|
C|-0--0-0-00-00-----000-00-00-|
G|-0--0-0-00-00-----000-00-00-|
C|-1--1-1-11-11-----111-11-11-|
   *  * * ** **     *** ** **

OR!

like this... either way sounds fine though
d|----------------------------|
A|----------------------------|
F|----------------------------|
C|-3--3-3-33-33-----333-33-33-|
G|-2--2-2-22-22-----222-22-22-|
C|-1--1-1-11-11-----111-11-11-|
   *  * * ** **     *** ** **