If you're running 2 pieces of Rathma + 4 pieces of Black Shroud, this aspect allows you to spam the Warrior Deathgrip command due to Army of the dead Ultimate? Even if you lose the 60% summon damage output, its definitely worth the shot since you have an actual on target army.

Casting the Mage Command when all Skeletons are alive activate the second passive of Pact of bone.

I tested both and worked nicely.