Tantric - Mourning
Tune all strings down a half step, then drop Gb to F.
Low To High - Eb Ab Db F Bb Eb

Not sure if the dropping Gb to F is really used, but it sounds pretty
close I think. Also I believe they use a 12-string guitar.

Intro Riff:
|---------0--------------0-------------0---------0-------0----------|
|-----------0------------0---------------0-------0-------0----------|
|----------------------0-----0--------------------------------------|
|------9-------------7---------0-----2---------5--------------------|
|----9-------------7---------------2---------5---------7------------|
|--7-----------5-----------------0---------3-------5----------------|

|--------0---------------0-------0----------------------------------|
|----------0-------------0-------0----------------------------------|
|----------------------0----0----0----------------------------------|
|------9-------------7--------0--4----------------------------------|
|----9-------------7-------------5----------------------------------|
|--7----------5------------------3----------------------------------|

Verses: (just back and forth between these chords)
        (couldn't decide which chord sounds better, so I put two
         different versions of the second chord)
|----0------0--------------0-----0----------------------------------|
|----0------0--------------0-----2----------------------------------|
|----5------0-------OR-----5-----0----------------------------------|
|----0------11-------------0-----0----------------------------------|
|----5------9--------------5-----2----------------------------------|
|----3------7--------------3----------------------------------------|

Pre-Chorus:
|---0-------0-------------------------------------------------------|
|---0-------0-------------------------------------------------------|
|---7-------5-------------------------------------------------------|
|---7-------5-------------------------------------------------------|
|---7-------5-------------------------------------------------------|
|---5-------3-------------------------------------------------------|

Chorus: (you can let the two high strings ring during this too, if
         you mute the 3rd string)
|--(0)--------------------------------------------------------------|
|--(0)--------------------------------------------------------------|
|-------------------------------------------------------------------|
|---9-9---7---7-7---4-4---5---5-5-----------------------------------|
|---9-9---7---7-7---5-5---5---5-5-----------------------------------|
|---7-7---5---5-5---2-2---3---3-3-----------------------------------|

During Solo:
|-------------------------------------------------------------------|
|-------------------------------------------------------------------|
|-------------------------------------------------------------------|
|---9-9---7---2-2---5---7-7-----------------------------------------|
|---9-9---7---2-2---5---7-7-----------------------------------------|
|---7-7---5---0-0---3---5-5-----------------------------------------|

tabbed by zipztabs.com
Enjoy!