Variant: Quasit Familiar

Mortal spellcasters interested in extraplanar familiars find quasits easy to summon and eager to serve. The quasit plays the part of  the obsequious servant. It serves it's master well, but it goads the mortal to greater and greater acts of chaos, and evil. Such quasits have the following feature.
Familiar. The quasit can 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 quasit senses as long as they are within 1 mile of each other. While the quasit is within 10 feet of it's master, the master shares the quasit's Magic Resistance trait. At any time and for any reason, the quasit can end it's service as a familiar, ending the telepathic bond.