Manes

The manes, i, is a minor demon which travels in large packs. Manes are very weak and slow.

Name

The word "manes" is both singular and plural - there is no such monster as a mane. This is because the word is imported directly from Latin ("manes"), where the rules of pluralisation are different.

Strategy

It is an exceptionally unfortunate character who has trouble defeating manes; however, swarms of them can overwhelm weaker characters.

Mythology

In Roman mythology, manes are the spirits of the dead. Wikipedia has more details.

Encyclopedia entry

The gnats of the dungeon, these swarming monsters are rarely seen alone.