I think the proper way to play it would be in drop B.  But since a lot of people including myself stay in standard, I learned by ear and tabbed it in E.

Kataklysm - Face The Face Of War

Intro
|-------------------
|-------------------
|-------------------x2
|-4-4-4-4-4-4-4-4---
|-2-4-4-4-4-4-4-2---
|-2-2-2-2-2-2-2-2---

Hardcore riff
|-------------------------------------------------
|-------------------------------------------------
|-------------------------------------------------
|-4-----4-----2----4p0----------4h0---5p2---------
|-2-222-2--2---4-2------2-222-2-----2-----2-222-2-
|-------------------------------------------------
  pm...          .        ...       .       ...

cont'd
|----------------------
|----------------------
|----------------------
|--2---4p0-5p2-4p0--2--
|-2-4-2---2---2---2---4
|----------------------

faster
|------------------------------------------
|------------------------------------------
|------------------------------------------
|------------------------------------------
|-22222-44444-55555-44444444-222222-0000000
|------------------------------------------

still fast
|------------------------------------------
|------------------------------------------
|------------------------------------------
|-22222-44444-55555-44444444-222222-0000000
|------------------------------------------
|------------------------------------------

solo rythm riff
|-------------------------
|-------------------------
|-------------------------
|-5----5-0----2-----2-0---repeat several times
|-5----5-0----2-----2-0---
|-3----3------0-----0-----

'solo' riff
|------------------------------------------
|------------------------------------------
|-----------------------------------------7
|-----------7---------9---------10---------
|-7-10-9-10---10-9-10---10-9-10----10-9-10-
|------------------------------------------

|----------------------------------------
|----------------------------------------
|----------------------------------------
|---------10---------9---------7---------
|-10-9-10---10-9-10---10-9-10----10-9-10-
|----------------------------------------

www.cox-internet.com/levithan