User blog comment:B214/Volume 23 discussion blog/@comment-77.188.210.226-20170509230841/@comment-31137559-20170511015715

Well you have to consider that gods are very different from all the other species. Gods are basically the strongest species. Why do you think all the gods(and god-class beings) competing in the Azazel Cup are worth the max number of evil pieces? They have something that doesn't allow evil pieces to work on them and that's divinity(well for most of them). And plus what god would want to serve under a devil anyway? Unless you're Sirzechs or Ajuka, the god in your peerage would make them far stronger than you. And plus there is such a thing as being too strong for an evil piece. Kuroka and Macgregor Mathers took up two bishop pieces. What do you think it'd be like for a god? Ajuka most likely couldn't adjust the evil pieces for gods nor would he want to.

Think about it. Issei with just a Longinus took all 8 pawn pieces to turn into a devil. Saji, who just had one Sacred Gear with the ability of a Dragon King took 4 pawn pieces to turn into a devil. Gasper with just a fragment of Balor's consciousness required a mutation piece. Surtr Second who was just a clone of the legendary fire giant required a mutation piece. Souji required two knight pieces because he turned his body into a nest of youkai using magic rutuals. And are any of these guys gods or at the level of gods? All 8 of Issei's pawns are now mutation pieces and because of DxD, they can't even contain the power of Infinity within him.

Those that evil pieces won't work on:


 * Gods/Buddhas(Demigods are fine as long as they're not too strong or have too much divinity I believe.)


 * Grim Reapers(Although they're not officially gods, I don't think Evil Pieces would work on them regardless. They might. I'm not too sure. But the main reason Bennia was able to be reincarnated was because of her mother being a hunan. So halflings are fine.)


 * Fallen Angels and Angels(Due to them being opposing existences to devils. Fallen angel hybrids are fine though. Now angel hybrids is a whole different story. Most likely not possible.)


 * Others(Beings that are far too powerful. Heavenly Dragons, god-class creatures such as Fenrir and Typhon, etc.)