PoB: https://pastebin.com/CfUjrJD3

The combo:

1. Use Corpsewalkers to generate corpses. This enables the corpse path of the Necromancer ascendancy.
2. Use Blood Offering from Bloodbond to consume the corpses. Use the Offering path from Necro to grant us a huge chunk of that life regen, enabling us to sustain Righteous Fire.
3. Use Soulwrest to summon a Phantom every time we consume a corpse, which is very often.
4. To not kill ourselves with 3 Blood Offerings /s we use a lvl 1 CwC and Leash of Oblation to link 3 more offerings.
5. Also use Escalation, Call to Arms and Enduring Cry for more sustain and mitigation.

The idea is that we walk-simulator through packs which should explode rather quickly in our circle of Righteous Fire and the clear from Solar Guard Spectres. The Phantoms will murder any surviving rares and provide the majority of our single target damage.