Since most of my readers probably don't play WFRP 2e, here's another monster for Labyrinth Lord.
No. Encountered: 3d6 (3d10)
Armor Class: 7
Hit Dice: 1d4
Attacks: 1 (Bite)
Hoard Class: XX
Awful rats are a strange breed of creature found only in the most demon-haunted ruins of the Dark Country - though rumors say that varieties may be found in the Desert Lands and far off Cathay. They are extremely large rats, though not as large as giant rats, that possess the heads and intelligence of crows. They tend to be social animals, building large nests in subterranean environments.
Awful rats leap up to attack their opponent’s face. On a to hit roll of 20, it has struck the opponent’s eye, and a second to hit roll must be made. If this second roll is a hit, the rat has taken the eye right from its socket. It will typically then scurry away to eat its prize in private. If using death a Death and Dismemberment or Critical Hit table, this mechanic may be replaced with assuming that any time such a table would normally be consulted, the awful rat snatches out an eye.