There is genuinely vanishingly little plot potential left.

There is nothing that will justify character moments other than Melon and Vastor. Learning new magic feels slow, and the children feel like a distraction. Any show of emotion in battle is dampened by the fact that it's the tenth time something similar is happening. Please let it end.

There is still a small chance that a sequel could work. There's still potential that Vastor vs Lith will be big enough to justify Guardianship. And in any case we should never have come this far. Guardianship should have been something he chose at dull Violet or just Violet.