User blog comment:B214/Question and Answers 2/@comment-202.152.195.67-20140602125544/@comment-1359322-20140603013642

There was no mention of it being the Dimension Create in Volume 9. In Volume 9 it was still in normal state, i think. At least it was as mentioned.

""Ah yes. The techniques of our three factions were most likely leaked. This place likely applies game field methods. --So, the power of the mist should also be transferred to this replicated territory. Can Dimension Lost's mist transfer anything that it wraps itself around? ...To be able to transfer me and Rias' servants all together at once to this place without any warning signs... A Longinus truly is terrifying.""