User blog comment:Crimson and Darkness/DxD Updates 2~/@comment-31091776-20170326054359/@comment-30924344-20170326124218

"Isee uses his wyvern to give Xenovia an armour similiar to Rias's one. Xenovia calls it Crimson Destruction Dragnar. She says its same but also different to Rias's Crimson Extinct Dragnar. Everyone is shocked at this. Though Rias simply smiles. Rias asks Rudiger if all of this was within Rudiger's foresight. Nero also takes on Xenovia by using his BB."

It was revealed in Upsetting Sorcerer 2