this is a tab from DooM2
it is in drop d
it sounds correct(but there are maybe some errors)
email me at prince_of_darkness5555666@yahoo.com

main riff
e|--------------------------------------|x4
B|--------------------------------------|
G|--------------------------------------|
D|------0-3-3-0-8-8-0-7-7-0-5-5-3-5-3-2-|
A|--------------------------------------|
D|--------------------------------------|

sounds like chorus
e|-------------------------------------------------|x2
B|-------------------------------------------------|
G|-------------------------------------------------|
D|-------------------------------------------------|
A|-----6-6-6-5-----6-6-6-5-----6-6-6-5--3--5--3--6-|
D|-------------------------------------------------|

rythem sounds like
(played with main riff)
e|--------------------------------------|x4
B|--------------------------------------|
G|--------------------------------------|
D|------0-3-3-0-8-8-0-7-7-0-5-5-3-5-3-2-|
A|------0-3-3-0-8-8-0-7-7-0-5-5-3-5-3-2-|
D|------0-3-3-0-8-8-0-7-7-0-5-5-3-5-3-2-|

played with chorus
e|------------------------------------------|x2
B|------------------------------------------|
G|------------------------------------------|
D|------6-6-6-5------6-6-6-5------6-6-6-5--3|
A|------6-6-6-5------6-6-6-5------6-6-6-5--3|
D|------6-6-6-5------6-6-6-5------6-6-6-5--3|

thats it
hope you enjoy it