this is just the main part of the intro. i haven't figured out the rest.
/=slide
.=palm mute
[ Tab from: https://www.guitartabs.cc/tabs/a/as_i_lay_dying/seperation_tab.html ]
first guitar
D-------------------------------------------------------|
A-------------------------------------------------------|
G----------5-7-7/8--------5-7-7/8-7-5-------------------|repeat
D-----0-------------0-----------------8----------------|
G------------------------------------------------------|
C------------------------------------------------------|
second guitar
D-------------------------------------------------------|
A-----------5-7-7/8-------5-7-7/8-7-5-------------------|
G-----0-------------0-----------------8-----------------|repeat
D-------------------------------------------------------|
G-------------------------------------------------------|
C-------------------------------------------------------|