User blog comment:B214/Question & Answers 5/@comment-207.96.205.2-20160517060930/@comment-82.199.203.215-20160520115054

Yeah that part always confused me, Zekram called Rizevim Bocchan from what I understood with V13's Milicias chapter it means young master, I guess it means that the first gens of 72 pillars were original Lucifer's servants. The author never really explained how the devils came to be or how the first Lucifer came to be(you know if he was a Seraph and the God of the Bible cursed him when he fell or something like that), though I doubt he will ever explain that.

P.S. I didn't know that Ophis made DxD L's chant too, I thought Vali made it up himself(the spoilers didn't mention anything about that).