Black Zenith [Adventure RPG / Chapter Four: Fires of Heaven]

((Quick questions. Could I replace the current spell in the focus with a new one in a single turn, or do I have to use up the current spell first? And if it's the latter case, do I have to wait for the cooldown before putting a new spell in? I think I know the answers but I'd like to be sure.))

You can put in a new spell and you will then be able to use the item on the turn after this one. Only loss is that you need to spend that turn on putting it in, effectively wasting your turn unless you put in the thing you wanted before entering combat. So basically, pre-planning. Or random-planning in Nos' case.