I don't know what the point of this spin off is. Just to reinforce that Urek is OP AF??? We had that lore drop in beginning about Phantaminum I guess. Would prefer that the main series continues tbh. Especially considering how long and ambitious it is.
One, to give us info on the outside world from the character most connected to it.
Two, to set the pace and be used as a testing ground for better reception of season 4, aka it's practice if you will.
Three, to set the ground up so we understand just how important Urek is gonna be as a main character himself to this series.
Four, to set up a way to begin possibly telling more stories set up from TOG and lay the groundwork for when Urek eventually leaves the Tower and be used as the perfect tool to visuly explore the outside.
Five, to lay the groundwork for further Urek wank in the future when we see him perform some extreme feats people thought impossible for even someone of his calliber.
I mean if we were to see him pull out an extremely powerful unknown weird power entirely separate from Shinsoo in the main story then you can be damn sure everyone is gonna call it an asspull or that it came out of nowhere.
So SIU is letting the audience know right now that Urek is hiding a lot more power than we originally thought possible and that he's gonna become extremely relevant beyond plot device reasons like before.
That's all of it basically.