I'll probably swap this up after picking up [Primed Expel Corpus], but for now, this is the build I use in index. [Lethal Torrent] and [Anemic Agility] are overkill once you stack razorwingx4, so we forego them to grab more elemental damage. Once I have [Expel Corpus], Ill likely just swap it in for [Frostbite] and swap [Pathogen Rounds] for [Convulsion] for the radiation damage to Alloy Armor. I'll have to see how this affects ttk, though, since it does less damage to shields and without viral, our slash procs are less useful.
Build Updated 8/10/22 - swapped primed heated charge for primed expel corpus, behavior changes as expected. This build will go deeper into Index than every other build I've seen on Overframe due to the usual slash+viral synergy along with stacking primed expel corpus on top of itself (initial damage and bleed proc). That being said, the radiation variant of this build is faster TTK than this build until around lvl 500 (Auditors).If you're just popping in for a couple million credits, use this build instead: https://overframe.gg/build/351135/
NOTE: This build only takes 3 forma. One of the Madurai-polarized slots is not needed. I only add it to support my alternate configuration of this weapon.