Basically you need exactly 1230 Spirit to do a good rotation with her. With 1000 you can use Rage of Xiphos 4 times during each Heven's Fury phase and it takes roughly 8s to fill that up, with 1200 you can use Rage of Xiphos 5 times during each rotation and it takes roughly 10s to fill that up so it's a net gain; I add an extra 30 spirit because sometimes it bugs and you go into Heven's Fury with less than max Fury.

The rotation is : open up with Angelic Smite to knock the boss down > use a medikit to gain 100 spirit > Rage of Xiphos + Know my name and weep, now that you've applied the vulnerability and bleed (it's very unlikely that writhing ribbond didn't proc thanks to row1talent2) you can use your signature for maximum damage, after that Ichor's Wrath + Stunning's Ichor and use any other power as soon as they come off cooldown until you gain max Fury.

When you have max Fury, spam Rage of Xiphos until you run out, then KMNAW > SI > IC > AS and go on again until you have max fury again

I'm using cosmics on slot2 and slot3, mh.info isn't updated yet so I can choose them

Slot2 cosmic should have : Critical hit rating + Critical damage rating + Brutal damage rating  + % to gain 876 damage rating, 10% attack speed and move speed for 10s.

For terminal farming, it's better to switch to Hypnotic Ribbons instead of Stunning Ichor and use Guardian Ribbon instead of Apprehending Ribbons, so that Hypnotic Ribbons will apply the bleed of Writhing Ribbons and heal you for a good chunk of HP.

Cosmic TTK 1:31 [Check to see the rotation]

Cosmic Kurse Full Bounty 1:20

Cosmic Ultron Full Bounty 2:00

Cosmic Kl'rt Full Bounty 2:28