Dullers are humanoid, grey entities that lurks behind the wall in The Void.

Dullers usually hides behind the walls using noclip waiting for a person to get close to the wall the Duller is hiding in

to noclip its arm through the wall to pull the victim into the void for some horrible fate.

Dullers are also known for exiting the wall its hiding in when the victim runs when he sees its hand to give chase.

When the duller enters this physical state, they look like white humanoid  entities with no face. The arm is also grey when

it enters the physical state to drag the victim through the wall. However, Once the duller is hiding in the wall and nothing

of him is physical, he looks like a blue drawing of him in the pitch black void as a “wallpaper” where it’s “drawed”