And I can't even outline this scene because I need to know what all the rest can do. They are all experienced in the field and know not to blast through all their combat spells before the day is well begun. But I can't know how to dole them out without knowing what they are.
Our heroine is easy, fortunately. She has no spells of direct offensive use. (MWAHAHAHAHAHA! You can get away with things as a novelists that no player would let you do as DM.) And another character is purely a rogue. But every other character in the party has spells.