Drop D tuning I think but it may be dropped down further.

Intro
G|-----------------------------------|
D|-----------------------------------|
A|----55---55-------55---55---5-5-6-5|
D|-000--000--0000000--000--000-------|

Verse
G|-------------------|
D|-------------------|
A|-------------55--55|
D|-0000-0000-00--00--| x8

G|---------------------|
D|---------------------|
A|---------------------|
D|-00-5-0-3-00-5-3-5-2~| x2

G|---------------------|
D|---------------------|
A|---------------------|
D|-222222-666666-444444| x2

G|-----------------------------|
D|-----------------------------|
A|-----------------------------|
D|-0-0-0-0-222222-666666-444444| x4

G|----------|
D|----------|
A|----------|
D|-00000000~|

Bridge (sort of)
G|-------------|
D|-------------|
A|-------------|
D|-0002-0-00002| x4

After 4 times play:
G|-------|
D|-------|
A|-------|
D|-000000|

Then play the bridge 4 more times.

Then: "So nail the casket one more time"
G|-----------|
D|-----------|
A|-----------|
D|-0h4p2h4p0~| x3

"Nail the casket one more time"
G|-----------------|
D|-----------------|
A|-----------------|
D|-00002-000000-4/6| x4

G|-----------|
D|-----------|
A|---------5~|
D|-00000000--|

Growls: "Nail the casket one more time"
G|-----------------|
D|-----------------|
A|-----------------|
D|-00002-000000-4/6| x4

"Twist the knife" Play once before this and once after.
G|-----------|
D|-----------|
A|-----------|
D|-0h4p3p2p0~| x2


G|------------------|--|---|
D|------------------|--|---|
A|------------------|--|---|
D|-0h4p3p2-0h4p3-0h4|x4|-0~|

G|------------|
D|------------|
A|------------|
D|-22-22-00-22|

G|----------------------------------|
D|----------------------------------|
A|----------------------------------|
D|-00-00-8p6-6p4-4p2-2p0-00-444-6666| x4

"Do not change the subject"
G|---------------|
D|---------------|
A|---------------|
D|-0000-0000-0h2~| x4

G|-----------------------|
D|-----------------------|
A|-----------------------|
D|-22222222-444444-666666| x4

G|---------|
D|---------|
A|---------|
D|-00-4p3p2|

G|-----------------|
D|-----------------|
A|-----------------|
D|-0-0h2-0-00-4p3p2| x5

Guitar plays riff twice
G|----------------|
D|----------------|
A|----------------|
D|0-1-2-000-00-01~| x8

Ending
G|-------------|
D|-------------|
A|-------------|
D|-0-1-2-000-2~|

Thats it.

Please rate, cheers.