Chords throughout song: 

F Bb Dm Dm

Dark seeks dark bit:

  The dark seeks dark
e|-------------------|
B|-------------------|
G|-10-10---10---10---|
D|-12-12---12---10---| x2
A|-------------------|
E|-------------------|
   Oh   oh     darker
e|-------------------|
B|-------------------|
G|-10---10/12---10-10|
D|-8------------7--7-| x2
A|-------------------|
E|-------------------|