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 :)