User blog comment:Hitsuji Mamoru/Servant Creation Room 2 : Guess of the Who/@comment-27971189-20170312170027/@comment-4802891-20170313172349

Aaah so it is personal territory affecting every person in it individually (hence the Anti-Unit type), and not a "bombshell" like Enuma Elish, Photon Ray etc.

That's a very important hint. This "domain"... when he summoned it, does he stays outside of it, or get in to deal the pain himself?