these modifications come in many different shapes and sizes all with varying uses. but generally, an input and output are needed. to allow mana to be taken into the body and for it to be expelled in the form of spells.

The ability to use magic was not gifted to humas as it was to many other creatures, but as human do, they figured out a way to use it anyway. Modifying themselves with the necessary components to cast spells. though this does have many strange side effects.