When a wand component, and by extension a wand crafted with that component, excels at casting a certain spell, it often excels at casting closely related spells. A related set of spells that all have the same elemental or phase and that tend as a group to be exceptionally well strengthened or focused by wands having certain component(s) is called a spell set. For example, if a wand is crafted with a component having the elemental Air and this wand excels at casting one weather control spell, ...