Dimensional portal.
This is the passage connecting two worlds.
For Reiger, traversing this path is something he's extremely accustomed to, even though the process always gives him the feeling that he doesn't know how long it will take to reach the end, while he himself is in a ghost-like state, unable to feel the weight of his body, just drifting endlessly forward. Still, Reiger persists in his familiar way, flying towards the light at the end.
Usually, if there are no unexpected events, he should finish this Dimensional Travel as before once he sees the light at the end and return to the Akasha continent.
However, this time during his Dimensional Travel, Reiger encountered something he's never faced before.
"Detected a dimension belonging to the same original world as the Akasha continent."
"Detected that the original world is attempting to establish a connection with the dimensional cube."
