[@Stitches] Swapping Spells is pretty much in the name. During a "Long Rest" which is essentially 8 hours of rest, usually spent sleeping, you may swap a spell out from your "prepared spells" which are just spells you've memorized, for another spell from your spell list, which I linked in the previous post. This process is usually very different for each spell casting class, but for this adventure, I'm going to simplify it for an easier time.