Magic is the application, manipulation, and creation of energy using some sort of magically active biological or inorganic structure. For example, one of these structures could be some sort of organ which can control Umbra, as this organ can control, manipulate, and create energy, this is classified as a magical organ.
Organisms or structures that can control magic, or are heavily involved in its use, are known as “Magical”.
Magic can be applied to the Prime Material Plane with multiple different inorganic or biological structures. These are predominantly staffs, wands, biological organs, and most commonly Masks. Magic is common, as it in simple terms is just the creation and manipulation of a type of energy. As such, in some ways manipulating kinetic energy with technology, or just locomotion appendages could be considered magic on a technicality.