If anyone's looking for a giggle at my own incompetence.
Spoiler:
So. Act III. Just figured out now how Pictos and Lumina work. Was trying to figure out how the hell to share the limit breaker over my party, because having Maelle as the only character who can break 9,999 was making grinding to prepare for the final showdown....complicated and a fucking draaaaaaag.
For further incompetence, in my panic at thinking that we maybe shouldn't kill the Paintress after she cast protective magic on my party before we took her down, I googled to see if there were choices you could make. AI overview immediately showed Maelle's final choice. Fml.