Critterfolk

Darkvision. 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.   Keen Smell. You have advantage on Wisdom (Perception) checks that rely on smell.   Rodent Mobility. Due to your rodent-like nature, you have a natural burrow speed, applicable only on soft surfaces such as dirt, snow, or sand. Harder surfaces like wood, stone, or metal are too dense for you to dig through.   Brave. You have advantage on saving throws against being frightened.   Bite. You have a bite attack with which you are proficient, that deals 1d4 piercing damage, and has the finesse property.

Languages. Common, and Sylvan.