How about increasing the cost somehow?
Banish requires the sacrifice of an item of some minimal level of quality to work, say. Or, it has some percent chance to eat such an item from inventory (maybe you get to choose) in order to work, and always fails if you possess no qualifying item? Though by the time you get to levels where it matters you would surely have something, though probably not many that you want to sacrifice.
Or maybe give it a more significant hitpoint cost.
Or something.
Banish requires the sacrifice of an item of some minimal level of quality to work, say. Or, it has some percent chance to eat such an item from inventory (maybe you get to choose) in order to work, and always fails if you possess no qualifying item? Though by the time you get to levels where it matters you would surely have something, though probably not many that you want to sacrifice.
Or maybe give it a more significant hitpoint cost.
Or something.
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