Blue Mage vs. Level Sync

[Astarotha]

actually, the way id fix that issue is not by restricting the spells through lvl but the number of available spell slots when you lvl sync, since you already have ilvl caps in place capping your upper end gear can add and potency is potency across all classes

now a second sort of check you could do as well is a general "do you have at least one x type spell" check like at level 15 do you have at least one single target, buff, cone, and aoe spell in your active slots? (the most direct way is to restrict a couple slots to specific spell types like slot 1 only accepts single target spells, you still get an incredibly customizable spellbook but you would "cover your basics" so to speak this way)