The song consists entirely of the following:
G G/B C D/F#
G: x(10)9787
G/B: x2003x
C: x32010
D/F#: x54232
Also, for the sake of being thorough, from :21 to :53 a second guitar plays:
[ Tab from: https://www.guitartabs.cc/tabs/b/brave_saint_saturn/invictus_tab.html ]
e------------------------------------------------------|
B------8-8---8-8---8-8---8-8---8-8---8-10---10-10---10-|
G----7-----7-----7-----7-----7-----7------7-------7----|
D------------------------------------------------------| x3
A-10---------------------------------------------------|
E------------------------------------------------------|
That is all.
