Variant: Imp Familiar

Imps can be found in the services of mortal spellcasters, acting as advisors, spies, and familiars. An imp urges it's master to acts of evil, know the mortal's soul is a prize the imp might ultimately claim. Imps display an unusual loyalty to their master, and an imp can be quite dangerous if it's master is threatened. Some such imps have the following trait.
Familiar. An imp can enter into a contract to serve another creature as a familiar, forming a telepathic bond with it's willing master. While the two are bonded, the master can sense what the imp senses as long as they are within 1 mile of each other. While the imp is within 10 feet of it's master, the master shares the imp's Magic Resistance trait. If the master violates the terms of the contract, the imp can end it's service as a familiar, ending the telepathic bond.