This is the main riff throughout the song, the only other bit is the interlude and solo, 
I don’t know yet.

Tuning: Drop-D

* = Palm mute
h = Hammer on
p = Pull off

e|-------------------------------------------|
B|-------------------------------------------|
G|-------------------------------------------|
D|-2-------2-------2-------2-------2h3-------|
A|-2-------2-------2-------2-------2h3-------|
D|-2-0-0-0-2-0-0-0-2-0-0-0-2-0-0-0-2h3-0-0-0-|
     * * *   * * *   * * *   * * *     * * *

e|-------------------------------------------|
B|-------------------------------------------|
G|-------------------------------------------|
D|-3-------3-------3-------3-------3p2-------|
A|-3-------3-------3-------3-------3p2-------|
D|-3-0-0-0-3-0-0-0-3-0-0-0-3-0-0-0-3p2-0-0-0-|
     * * *   * * *   * * *   * * *     * * *

Easy :)