Brown Pseudodragon

Keen Senses: The pseudodragon has advantage on Wisdom (Perception) checks that rely on sight, hearing, or smell.

Magic Resistance: The pseudodragon has advantage on Saving Throws against Spells and other magical Effects.

Limited Telepathy: The pseudodragon can magically communicate simple ideas, emotions, and images telepathically with any creature within 100 ft. of it that can understand a language.

Tunneler. The dragon can burrow through solid rock at half its burrow speed and leaves a 5-foot-diameter tunnel in its wake.

Variant: Familiar: The pseudodragon 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 pseudodragon Senses as long as they are within 1 mile of each other. While the pseudodragon is within 10 feet of its companion, the companion shares the pseudodragon's Magic Resistance trait. At any time and for any reason, the pseudodragon can end its service as a familiar, ending the Telepathic Bond.

Bite: Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 4 (1d4 + 2) piercing damage.

Sting: Melee Weapon Attack: +4 to hit, reach 5 ft., one creature. Hit: 4 (1d4 + 2) piercing damage, and the target must succeed on a DC 11 Constitution saving throw or become Poisoned for 1 hour. If the saving throw fails by 5 or more, the target falls Unconscious for the same Duration, or until it takes damage or another creature uses an action to shake it awake.

Sand Breath (recharge 5-6). The dragon exhales a whirling cloud of corrosive sand in a 10-foot cone. Each creature in that area must make a DC12 Dexterity saving throw or take 10 (1d8 bludgeoning plus 1d8 acid) damage and be blinded until the end of its next turn. On a successful save, the creature takes half as much damage and isn’t blinded.