maybe there could be some type of special creation.
that for example gains strength from skills into all 3 types(fire/magic/battle).
As it is now for example, putting skills into all 3 areas is a waste and fire is generally the strongest area.
And you're allowed max one type of this creation so other creations are still used.
Or maybe some other way to make battle creations more useful as I found them to be weak compared to fire.