(Courtesy of Aaron R, Ash Law, and Graham Poole on G+)
Ratlings are like skaven, if you're familiar with Warhammer Fantasy. About 3 foot tall, look like a humanoid rat. They are the result of long ago magical experiments that managed to escape and breed true. Common to sewers, living dungeons, and other underground areas. Vermin, but very cunning and dangerous vermin as they have a super natural ability to control rats. Don't get along with wererats. Often speak broken common.
Groups of tiny rats that flood over you and rip and tear, gnaw and nibble, and generally make female barmaids stand on tables and scream.
Level 0 mook
Initiative: +4, HP: 5 (mook)
Frenzied Biting: +5 vs AC, 3 damage
Tide of Rats: Any enemy ending their turn engaged with the Rat Swarm takes 1 damage.