Ratfolk

Ratfolk can trace their entire history back to 2569 F, when the city of link was preparing for a siege. The military leaders within the city knew that the sewer system was going to be a major weak point in their defenses against the siege, and hired powerful mages to devise a way to protect them. In a freak accident, the wildmage who was hired created a fascinating and horrifying hybrid between a sewer rat and his assistant, who ran away to disappear into the sewers. The city was lost to the invaders as they rose up from the sewers, undefended, but the rat creature was never seen again until 5 years later the city was infested and then overrun by ratfolk.

A combination of disgust from other races, very short life spans, and unorganized minds prevent ratfolk from taking over the world, despite their rapid rate of reproduction and passable intelligence. For a few years, it might seem that a leader is emerging and uniting the regional ratfolk, while in the next few years, they seem to have changed their mind. Nothing is constant in ratfolk society—not leadership, not family, nor home. Most live in the dregs of cities, or in the sewers with the rats, who are more accepting than the people above. More live underground in caves abandoned by other, more industrious creatures, and still others live above ground in pop-up settlements that spot ratfolk history, never lasting more than a few decades at most.

Features
Ability Score Increase: Your Dexterity score increases by 2, and one more ability score of your choice increases by 1.

'''Age. '''Ratfolk age incredibly quickly, and live relatively short lives. Ratfolk reach adulthood by age 3, and live fewer than 20 years.

Alignment. Ratfolk inherited some of humans' variability, while gathering the rats' lawlessness. Most ratfolk are of chaotic alignments.

Size. Ratfolk are surprisingly tall for a cross between human and rats, generally ranging from 5 to 6 feet tall. Your size is medium.

Speed. Your base walking speed is 30 feet.

Darkvision: You have darkvision out to 60 feet.

Keen Senses: You have advantage on any perception checks that use smell.

Disease Immune. You are immune to all diseases.

Pack Tactics: You gain advantage on an attack if a teammate is within five feet of your target.

Rat Heritage. You may cast animal friendship an unlimited number of times, but you can only target rats and mice with this ability.