Death Throws. If the aavoloth dies it explodes, and each creature within 5 feet of it must make a DC 12 Dexterity saving throw or take 14 (4d6) acid damage on a failed save or half as much damage on a success.
Magic Resistance. The aavoloth has advantage on saving throws against spells and other magical effects.
Claw. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 5 (1d4 + 3) piercing damage, and the target must make a DC 12 Constitution saving throw, taking 7 (2d6) acid damage on a failed save, or half as much damage on a successful one.
Shapechanger. The aavoloth polymorphs into a beast form that resembles a rat (speed 20 ft.), a raven (20 ft., fly 60 ft.), or a spider (20 ft., climb 20 ft.), or back into its true form. Its statistics are the same in each form, except for the speed changes noted. Any equipment it is wearing or carrying isn't transformed. It reverts to its true form if it dies.
Teleport. The aavoloth magically teleports, along with any equipment it is wearing or carrying, up to 30 feet to an unoccupied space it can see.
Description
Aavoloths are small, mischievous yugololths that prowl the lower planes in search of food. Aavoloths are sometimes summoned to be familiers for powerful wizards.
Variant: Aavoloth Familiar
Spellcasters who are interested in unusual familiars find that aavoloths are eager to serve someone who has magical power. Unless its master is strict, a aavoloth familiar can be unruly, behaving aggressively toward other Tiny creatures. A aavoloth serving as a familiar has the following trait:
Familiar. The aavoloth can serve another creature as a familiar, forming a telepathic bond with its willing master, provided that the master is at least a 3rd-level spellcaster. While the two are bonded, the master can sense what the aavoloth senses as long as they are within 1 mile of each other. If its master causes it physical harm, the aavoloth will end its service as a familiar, breaking the telepathic bond.
It's awesome.