The more I hear about these ways of spell casting, the more I consider why not just have scrolls, so a spell book is nothing more than an elaborate "ring binder" of accumulated scrolls, each of which can be used to memorise (and remain) or can be cast from directly (and vanish), level limits apply so a spell caster can have a scroll with a spell they cannot memorise, perhaps waiting to when they do reach the appropriate level, and hopefully don't need to cast it directly in the meantime.
The availability of scrolls is normally limited, but this can be rectified by implying any enemy spell casters that are defeated will have scrolls of the spells they know somewhere in their treasure.
The more I hear about these ways of spell casting, the more I consider why not just have scrolls, so a spell book is nothing more than an elaborate "ring binder" of accumulated scrolls, each of which can be used to memorise (and remain) or can be cast from directly (and vanish), level limits apply so a spell caster can have a scroll with a spell they cannot memorise, perhaps waiting to when they do reach the appropriate level, and hopefully don't need to cast it directly in the meantime.
The availability of scrolls is normally limited, but this can be rectified by implying any enemy spell casters that are defeated will have scrolls of the spells they know somewhere in their treasure.
Good idea.