Since Voidians are mostly shadow, they can shapeshift into anything. Though if they get out into sunlight without something covering them, they go back to their shadowy form and have to wait about 20 seconds to shapeshift back.

Since Voidians have been living in darkness for a long time, they will be able to see in the dark. 

Voidians can cast their shadow onto their enemies and make them blind and deaf. 

Voidians are mostly made of shadow. So arrows and bullets have no effect on them. They can go through walls that don't have a torch on them. 

Voidians can teleport anywhere that is in the shadows and is shaded. 

Voidians can only speak the language Voidspeak. 

Voidians let out a horrific shriek that terrifies and paralyzes their enemies.