Drop A i think? (A E A D G B) I learnt this by ear. This is the intro riff, the really heavy one. It's so fun to play but thats the only riff in the song i cared to learn lol. It repeats itself a few times, hope this helps people. B-------------------------------| G-------------------------------| D-------------------------------| A-------------------------------| E-0-0-6-5-3-1-1/8-7-3-0-0-6-5-3-| A-0-0-6-5-3-1-1/8-7-3-0-0-6-5-3-|
https://primoaccordo.net/anaal-nathrakh/castigation-and-betrayal.htm