Backstabber

Appearance
Backstabber resembles a black rat. it is the same size as normal rat but are pitch black. The Grimm Mask is a shape of Rat's skull, with a red marking and the bone structure cover the tail.

Behavior and Habits
Backstabber is aggressive in high numbers, and large groups are more likely to attack everyone if they near them. While they are cowardly in smaller numbers, in swarms they can easily take down and consume Human, Faunus, and Normal Animal in a matter of moments.

They congregate in dark places whether Corpse or not and afraid of Bright Light.

Additional Notes

 * They often in the group of about Thirty.