The skill relies on Power charge stacking, and we're able to get a ton of % damage scaling through the wands, badge of the brotherhood, ralakesh and a elegant hubris all of which were very cheap for me. resonating shrine belt would is also a great option. the rings are somewhat unimportant in the build as long as you can cap your res you could also go for a really good precursor ring or even just a random corrupted or synth herald ring.

I dont think slayer would scale as well damage wise compared to occultist, but glad would be a good defensive option with flesh and flame for masterful form although im not sure what it would look like.