User blog:B214/Light Novel Volume 16 spoilers

Spoilers by n0m@n/Shin Code-Zero
 * Rizevim Livan Lucifer. Vali's grandfather is the 3rd Super Devil. Since Vali's father is the True Lucifer's Grandson, that makes this new Lucifer the real son of the True Lucifer!
 * Vali's father was worthless. Rizevim teased his son to throw Vali away and killed him.
 * He has an ability which is to nullify Sacred Gear's ability(Holy shit).
 * He's so vicious and brutal that even the Old-Maou descendents would pale.
 * The Vampire's country turns into a near annihilation state by Rizevim.
 * Rias's powerup. She defeats Grendel! Though Grendel was still alive even after he had half of his head blown away!
 * Koneko also shows her growth. Especially her breast!
 * Ophis's "other half" is called Lilith. Apparently raises a flag with Ise.
 * The Evil-Dragon of this volume is Crom Cruach. He was never sealed and he appears to be the strongest Evil Dragon.
 * Fafnir becomes beyond a mere pervert and something insane happens because of him....
 * Rizevim's preparing to go to the world where Chichigami is, and therefore is preparing to defeat Great-Red.
 * The organization is formed to counter him with the power of each faction. This group is called "DxD" and Koneko was the one that named it.
 * The leader will be Dulio. The sub-leader will be the First Gen Sun Wukong!
 * Rizevim only retreats because he got bored.
 * Ise gets a power up but something bad happens...
 * Vali gets of the hook by becoming Odin's adopted son.
 * It seems Arthur raised a death flag....
 * Apparentely the reason behind Gasper's power is due to the fraction of Balor's instinct.
 * Apparently it may become the 14th Longinus.....