Your Constitution score increases by 4.

Mustelidon mature rapidly, reaching adolescence at 5 and adulthood at 7.  On average, they live about 120 years.

Typically, Mustelidon are chaotic neutral.  Unless their solitude, territory or way of life is threatened, the average Mustelidon will keep to themselves and are loath to get involved in the affairs of others.

Mustelidon stand between 3.5 to 4.5 feet tall and average around 125 pounds.  Your size is medium.

Your base walking speed is 25 feet. Your speed is not reduced by wearing heavy armor.

Accustomed to nightlife, you have superior vision in dark and dim conditions. 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 color in darkness, only shades of gray.

You have advantage on saving throws against the poisoned condition, and you have resistance against poison damage (explained in the “Combat” section).

Through sounds and gestures, you can communicate simple ideas with badgers and similar beasts. Mustelidon like animals more than people and often keep squirrels, badgers, polecats, moles, weasels, and similar creatures as pets.

You have a swim speed of 15 feet and a burrow speed of 10 feet.

As a bonus action, you can move up to your speed toward an enemy of your choice that you can see or hear. You must end this move closer to the enemy than you started.

You have proficiency in the Intimidation and Survival skills.

You have advantage on wisdom and charisma saves against effects that would cause you to act or move against your will. For example: effects such as frightened, charmed, compulsion and the like.  Attempts to intimidate you are made at disadvantage.

You know the Resistance Cantrip. At third level, you learn the Absorb Elements spell and can cast it once per short rest at 2nd level. At 5th level, you learn the Stinking Cloud spell and can cast it once per short rest, you automatically succeed on the saving throw for this spell. Constitution is your spellcasting modifier for these spells.

You can speak, read and write Bestial (Terran), Mustelan (Dwarvish) and the language of the nation in which you were raised.  I.E. Lurosian, Ossunan, Meliodan, Etc..