Inferno tactics.

If your ratio of Pit Lords to Demons is around 7 to 10, it means you haven't really delved into demonology.

I'm just speaking hypothetically. You need 70 of them to raise 100 – and then the proportions follow. I mean that theoretically, it's possible – in reality, of course, there will be many more demons.
But I haven't really focused on demonology – only as a supplementary element. I didn't concentrate all my development on it – I don't know why.