Ratfolk

Ability Score Increase: Your Dexterity score increases by 2 and your Intelligence score increases by 1.

Age: Ratfolk live until they’re about 40.

Alignment: Coming from a past strife with food shortages and in-fighting, ratfolk are usually chaotic, though they do not lean towards either good nor evil.

Size: Ratfolk have small statures for their tight living spaces, and only sometimes get to be above 4 feet. You are small.

Speed: Your base walking speed is 25 feet.

Darkvision: Accustomed to the tunnels underground and the darkness of sewers, you are used to no lights being present. You can see in dim light within 60 feet of you as if it were bright light, and in darkness as if it were dim light. You can't discern colors in darkness, only shades of gray.

Refined Palate: Your familiarity with alchemy of all sorts and less than savory dishes has granted you the ability to discern even miniscule changes in taste. As an action, you can identify potions by simply smelling it. Additionally, you can tell immediately if anything you ingest is poisonous and are able to eject it before being subjected to any saving throw or damage unless you swallow it willingly.

Packrat: You are treated as a size category larger when determining carry weight limit. Additionally, when you attack an enemy when an ally is within 5 feet of them, you may give yourself advantage. You can use this a number of times equal to your Dexterity modifier (minimum 1), regaining uses after a long rest.

Incisors: Your teeth are long and sharp, and made to gnaw through nearly anything. You can use your incisors to make unarmed attacks. If you hit with it, you deal piercing damage equal to 1d4 + your Strength or Dexterity modifier (your choice). Additionally, given time, you can chew through anything weaker than stone, and you have a burrowing speed of 10 feet.