Covenant
Contractual Magic
Covenants are contracts struck between a practicing magician and an Elder. Elders are not particular to anyone race or life-form.
In order to harness magic from a forest as druids do, or form alliances with a particular species, a magician, be they Brewling or Fey, must first find its Elder and basically ask for permission. Should they succeed in striking said contract, its terms will be enacted immediately.
There are no visual effects. It is contractual magic.
Allows for magicians to embellish their own abilities either by granting them more power in the case of forested covenants, or allowing them access to familiars in the case of animalistic covenants.