Instead, Spire of Sorcery expects to do part of character maintenance on the overland map by eating and drinking potions. You can also do it via certain spells during battles, but you're already putting a lot of strain on yourself to just fire off a single offensive spell a turn; do you really have the time for that? And you can't just drag out encounters with inanimate objects - those are often accompanied by adverse environmental conditions that strike your characters every turn.
