Your Dexterity score increases by 2, and your Constitution score increases by 1.

Ratfolk mature much faster than humans. Ratfolk reach adulthood after 2 years, and their average lifespan is 30-40 years.

Ratfolk tend toward chaotic aligments. They have a strong sense of community with others from their colony but few other loyalties.

Ratfolk are smaller than humans, standing 3-4 feet tall. Your size is Small.

Your base walking speed is 25 feet

Accustomed to life underground, 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 only discern shades of blue and green in darkness, everything else appears as shades of those colors.

You have disadvantage on attack rolls and on Wisdom (Perception) checks that rely on sight when you, the target of your attack, or whatever you are trying to perceive is in direct sunlight.

You have advantage on Wisdom (Perception) checks that rely on smell.

You have advantage on an attack roll against a creature if at least one of your allies is within 5 feet of the creature and the ally isn’t incapacitated.

You have advantage on saving throws against poison and disease.

You can speak, read, and write Common, Undercommon, and the ratfolk language Squeekish. Squeekish is a fast language filled with squeaks and trills. Sentences are often truncated and short, and repeat more important words several times for emphasis.