Lung Fox (5e Creature)
From D&D Wiki
Tiny monstrosity, unaligned
Keen Senses The fox has advantage on Wisdom (Perception) checks that rely on sight, hearing, or smell
Innate Spellcasting The fox's innate spellcasting ability is Wisdom. It can innately cast the following spells, requiring no material components:
Magic Resistance The Lung Fox has advantage on Saving Throws against Spells and other magical Effects.
Variant: Familiar The Lung Fox can serve another creature as a familiar, forming a magic, Telepathic Bond with that willing companion. While the two are bonded, the companion can sense what the Lung Fox Senses as long as they are within 1 mile of each other. While the Lung Fox is within 10 feet of its companion, the companion shares the Lung Fox's Magic Resistance trait. At any time and for any reason, the Lung Fox can end its service as a familiar, ending the Telepathic Bond.
Bite Melee Weapon Attack: +5 to hit. Reach 5 ft. one target. Hit: 1d6 piercing damage.