Magic is the use of the soul to affect physical or Ethereal matter, usually through manipulating energies from afar.
In this system, magic is an extension of physics, and is logically aligned with established rules of physics. Every spell has a physical explanation based on common understandings of physics.
Energy cannot be created or destroyed, only changed forms.
All magic requires an energy source, typically, this is the user’s energy reserves (stamina)
Under this system, both magical and physical abilities cost Stamina.
More on how exactly the mechanics behind this is can be found in Magic Mechanics.