Instances differed from one another.
Different Double S-Rank Instances affected reality in different ways and represented different rules.
In fact, 730 rarely activated Double S-Rank Instances lightly, because the resentment they represented was often too intense, spawning far too many ghosts.
Most Double S-Rank Instances also had an S-Rank NPC presiding over them, so naturally, it avoided activating them whenever possible.
As for the previous Double S-Rank History Instance...
Aside from the underlying cause-overwhelming resentment-there was another important reason for its activation: that instance involved a demon and had no S-Rank NPC presiding over it.
Demons were supernatural forces that defied the established order, entities that required an instance to intervene.
The Instance System was a system spontaneously generated by the world itself. It possessed the world's authority and could transcend the constraints of time and space. Following its calculations, a History Instance capable of dealing with the demon emerged.
In other words, it was the demon's appearance that brought about the History Instance, an existence specifically designed to target demons and mitigate or alter the truly devastating consequences they had caused throughout history.
730 had directly incorporated time travel into the instance, combining it with an SS-Rank Instance's ability to affect reality and numerous other influences.
That was also why, although the demon knew the Instance System existed, it had not realized it was inside an instance during the History Instance.
Afterward, based on the direction the instance was developing, 730 had used Emma's obsession as both the fuse that triggered its opening and the clue to its conclusion.
However, Emma could not be considered an S-Rank NPC. As mentioned earlier, S-Rank NPCs typically represented a particular class of phenomena. Emma lacked that kind of attribute, so she was only a high-level NPC.
The main point of this lengthy