This is just the intro with only two guitars in it.
E-----------------------------------|
B-----7--------6-------6-------5--5-|
G---6---6---10---10--7---7---6--6---|
D-----------------------------------|
A-----------------------------------|
D-----------------------------------|
[ Tab from: https://www.guitartabs.cc/tabs/s/shadows_fall/stillness_tab_ver_2.html ]
E------------------------6---5-------|
B-----7--------6-------5---5---5---5-|
G---6---6---10---10--6-----------6---|
D------------------------------------|
A------------------------------------|
D------------------------------------|
Then while that is playing the heavy part kicks in about halfway through the intro
E-----------------------------------|
B-----------------------------------|
G-----------------------------------|
D--0------8-3-10---0----------------|
A--0------8-3-10---0----------------|
D--0------8-3-10---0----------------|