Succubi were fairly strong devils, and they were particularly well-suited for Domino Lauri to harness.
The other nobles of Impure Chant followed suit; the millions of nobles who descended into Hell shrank to a mere hundred thousand in just a few days. However, this sacrifice, completely indifferent to kinship, granted these tens of thousands of nobles immense power. They were practically all forces comprised of high-level devils, and if they worked together, they could sweep over many territories and become a massive force.
This wasn't difficult, after all, everyone knew each other well, and none were good people; nobody would choose to dredge up the past at this time.
As a result, Domino Lauri quickly regained control of power and reassembled the Council of the Unpure, aiming to carve out a place in Hell.
And then... she was conscripted by the Blood River Fortress.