User blog comment:Piyush Banerjee/Shin DxD 2 discussion/@comment-2601:87:8300:20D0:7CA8:4571:A3B3:1C41-20181130204001/@comment-207.242.44.6-20181130205359

i don't know but knowing rias she want one that let her and issei to fight at their best condition and that go for their teammates too. just like sairorg did in volume 9 or 10( i dont remember which).