PoB: https://pobb.in/B6nSjS2uVcXL
I have set spectre count to 25 to simulate all 5 spectres hitting with all 5 projectiles.
ADDITIONAL INFO:
You will want to use convocation all the time, getting the convocation cooldown recovery rate minion defensive mastery helps a lot, getting quality on the gem also helps.
I use void sphere to compact mob packs, making it easier for Forged Frostbearers to hit with all of their projectiles.
Animate Guardian gear:
Dying breath
Gruthkul's pelt
Windscream
Corrupted gloves with elemental weakness implicit
Leer Cast
Forged Axebearers are also insane, spam a molten strike that does cold damage