Riff 1:
(Heavy distortion)
Start off very careful, and than gradually release the palm mute and build up the sound by playing on the A and D Strings as well! 

E|-0---0-0--0-0--0-3-5-6-| x As many times as you like
  <--------- PM -------->

Riff 2:
(Heavy distortion)
|----------------|
|----------------|
|----------------|  
|-0---0-3-5-6-0--| x 3
|-0---0-3-5-6-0--|
|-0---0-3-5-6-0--|

|-------------------|
|-------------------|
|-------------------| 
|-0---0-3-5-6-5-3-0-| Repeat
|-0---0-3-5-6-5-3-0-|
|-0---0-3-5-6-5-3-0-|

Slightly mute t 0´s to get a heavier sound.

I know these are somehow basic, but anyone maybe wants to use them.
Id you want to use these riffs, u must contact me first at [email protected]