Ok so I'm trying this whole Nightmare thing just for shits and giggles and I tried to alter the class on some characters.
The issue seems to be with Sacred Stones' intro cutscenes because of the way Seth rescues Eirika.
See, when I change Fado's or Seth's class using the Nightmare module for the prologue cutscenes it's perfectly fine, but and changing Seth's class during the prologue chapter itself is fine too, but changing Eirika's class results in her appearing on the map BEFORE Seth drops her and then a second Eirika walks around for a second and then walks off screen. From this point on, the rom is perfectly stuck.
I'm guessing that it has to do with the event and Eirika's placement (as in, the X and Y Coordinates) but I wouldn't know how to fix this. Any ideas?