Physically, they are similar to ratfolk but have distinctive differences. They are at least a foot smaller than their ratfolk cousins with rounder features, fluffier and lighter colored fur, and brighter eyes. They are omnivorous, like ratfolk, but prefer fruit, vegetables and grains. They are less cautious than most ratfolk, often characterized as overly curious and gregarious. They are nimbler than ratfolk but do not have the subterranean survival skills of ratfolk since they live in agricultural and metropolitan environments.
Mousefolk live on the elven isle of Saesun. "Wild" mousefolk live in small forest communities that ally themselves with their Sylvanar neighbors. "Domestic" mousefolk live in small farming communities or settle in Iaurdin towns and cities. While ratfolk are often mistrusted and marginilized by humans, mousefolk are welcome neighbors. Mousefolk often get jobs as street cleaners, chimney sweeps, house servants, carriage drivers and gardeners.
Mousefolk have the same suite of features that ratfolk except: they get a bonus to Cha instead of Con, they lose Speak with Beasts and Sewer Dweller but gain Nimbleness and Naturally Stealthy. For your convenience, here are their features:
Ability Score Increase. Your Dexterity score increases by 2 and your Charisma increases by 1.
Age. Mousefolk mature quickly to adulthood at 10 years of age and live to about 40 years.
Alignment. Mousefolk are friendly, generous and helpful creatures. They tend to stay out of larger affairs. They are most commonly neutral good.
Size. Mousefolk are smaller than ratfolk, standing between two and three feet, and are not as hunched as their rat cousins. Your size is Small.
Speed. Mousefolk are slower than other races but can use their front paws to outpace most humanoids.Your base walking speed is 25 feet but, if you drop to all fours, your base walking speed is 35 feet.
Dark Vision. 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 grey.
Inquisitive Nose. You gain Perception as a skill and have advantage on all Perception skill checks involving your sense of smell.
Rodent Bones. Your bone structure is impressively flexible and you're used to moving through cramped spaces. You are considered one size smaller when attempting to move through tight spaces and take no movement penalty when doing so.
Nimbleness: You can move through the space of any creature that is of a size larger than yours.
Naturally Stealthy. You can attempt to hide even when you are obscured only by a creature that is at least one size larger than you.
Extra Languages. You can read, write, and understand the Raskaar language.