Intro(RIFF A)
E|----------------------------------|
B|----------------------------------|
G|-5-5-5-5-5-5-5-5--5-5-5-5-5-5-5-5-|
D|-7-7-7-7-7-7-7-7--7-7-7-7-7-7-7-7-|
A|-0-0-0-0-0-0-0-0--8-8-8-8-8-8-8-8-|
E|----------------------------------|

(RIFF B)
E|------------------|
B|-----0------------|
G|-5------5-----7---| - RIFF A  played during almost whole song
D|---7--7---5-----5-|
A|------------------|
E|------------------|

Chorus: I think that chorus goes like that:
     RIFF A and RIFF B played together


"...The unseen ,the eternal..."
"...Persevering,dying escape..."

E|------------------------------------------------------|
B|------------------------------------------------------|
G|-7-4-5-4-2---------------------------------7-4-5-4-2--| ...and again...
D|-0-0-0-0-0----3-3-3-3-3-3--5-5-5-5-5-5--7--0-0-0-0-0--|
A|--------------3-3-3-3-3-3--5-5-5-5-5-5--7-------------|
E|--------------1-1-1-1-1-1--3-3-3-3-3-3--5-------------|