Personally, I have a feeling Mullonde might be on our plane, rather than on the 1st shard. The spell back in FFT teleported the party to an existing area within the game, which is the same thing that happened here. If it is the 1st, then that would mean that there are *two* Mullonde, one on each world. Or that our world's Mullonde was transported to the 1st the first time Ultima appeared. That seems unlikely to me.

On the other hand, the bright light does give it an otherworldy aura. This might be a preview of the Flood of Light that's been hinted at in the last few MSQ, and perhaps even a hint that Ultima is close in nature to it. Or something along those lines.