This is such a great song from Biffy and seeing as all the other tabs of it are rubbish
offence, but they're nothing like it), I thought I'd give you the correct version I
myself. Play the bottom string notes with your thumb and pick accordingly to the song 
you listen. Enjoy!

Tabbed by: Joelycakes
Song: Many of Horror
Artist: Biffy Clyro
Album: Only Revolutions
Tuning: Drop D

Verse

E|--------------------------------------------------------------------|
A|--------------------------------------------------------------------|
G|---6--8s10-10--------1-3s5-5--------11-10s6-------11-10s5-----------|
D|---8--9s11-11--------3-4s6-6--------13-11s8-------13-11s6-----------| x2
A|--------------------------------------------------------------------|
D|-----------11--------------6--------------8-------------6-----------|

Pre-Chorus

E|--------------------------------------------|
A|--------------------------------------------|
G|---6--8s10-3---------1-1s6-3-------5--------|
D|---8--9s11-4---------3-3s6-4-------6--------|
A|-----------------------------------6--------|
D|-----------4---------------4-------6--------|


Chorus

E|---4-----6-----2--------|
A|---6-----6-----2--------|
G|---6-----6-----3--------|
D|---6-----8-----4--------| x2
A|---4-----8-----4--------|
D|---------8-----4--------|
     C#   Bbm    F#

Then the rest is a combination of G#, Bbm, F# and C# chords, good luck!