The Purifier Wars
Ratlings are a small race of bipedal humanoids formed from the combination of baseline human and rat genetic material. They were created near the dawn of the Age of Expansion as a quick, ready-made workforce for the earliest exploration corporations. As such, Ratlings are born in litters of up to 4 young at a time, and have a relatively short gestation period of only 7 months. The lifespan of the average ratling is greatly reduced from that of baseline and other mutant humans, however. Ratlings rarely live past 60 standard years.
In game terms, Ratlings use the rules included in the Star Wars book for Ewoks, with the removal of the Primitive trait.