This randomly came from my personal quality build and actually turned into what I think is the best Shiva build for SL120 while still maintaining "cosplay" (kinda gay word).
It is "Director's Cut" because Shiva was originally meant to betray the protagonist of Dark Souls for the Chaos Blade. I assume thereafter his bloodythirstiness' intellectual side drove him to curiously seek out the Chaos Pyromancies and use them to defeat all Occidental or Oriental contenders.
Anyway got some Chaos Firestorm for gank spanking, Chaos Blade for switching from the stunning but slow Murakumo to fast unrelenting attacks. Throw fireballs because they seem to work great when enemies accidentally roll back or time wrong (or lag).
Enjoy, this build is also versatile and I use many diff armor/weap combos.