Shadows

Shadows are black, phantasmal beings with piercing red eyes. They often take the on a humanoid appearance with wings that are partially transparent. For at least five years, shadows have besieged the City of Aurora, tearing into homes and slaughtering anyone left in the streets at night. Shadows are often led by Dark Minions or the most terrifying tools of the Darkness, the fearsome Sentinels. These creatures can even summon endless hordes of shadows into battle. However, the ultimate master of shadows is The Crawler, who even affectionately refers to the shadows as its "children." Shadows are hinted to be intelligent creatures, derived from their tactics and their social heirarchy. However, while intelligent, shadows are also extremely vicious, with the people of Aurora describing them as frenzied, insane killers that tear apart their foes. While they are viscous, they are known for how easy they are killed, but return in crowds.
After all
Where there is light
There will always be shadows.