Xasthur - A Gate Through Bloodstained Mirrors Chords & Tabs

This plays 4 times at the beginning and at other parts in the song.
These are just the chords... which I really do not know the names of being that Scott 
Conner uses some very strange chords.
Figure out the rhythm yourself.
[ Tab from: https://www.guitartabs.cc/tabs/x/xasthur/a_gate_through_bloodstained_mirrors_tab_ver_2.html ]
eb|-----------------------------------|
Bb|--0----3----3---------6----6----6--|
Gb|--4----4----5----5----5----6----5--|
Db|--2----2----2----3----3----3----3--|
Ab|--0----0----0----3----3----3----3--|
Eb|-----------------------------------|

I could very well be missing the changes into the chords, but this is close to how I 
heard the song.