Silent Wraith

Background
The Wraith is a long-feared species within the universe. Their whereabouts and their origin are unknown, and nobody has ever known what they are or what they all look like. All Wraiths are believed to be souls of the dead, being more disturbing the longer they are wraiths. These Wraiths can then go on to become dozens of other types of Wraiths. Some appear to be ghosts, while others have the appearance of humanoid warriors.

Characteristics
Silent Wraiths are a rare sub-species of Wraith that develop from regular Wraiths after hundreds of years. They are humanoid figures, except their torsos fade out of existence above where their legs would be. They are opaque in colour and allow light to pass through them. They float around with an ambient buzzing but become completely silent when an enemy is spotted.

Attacks
All Silent Wraiths carry Stealth Knives with them. They prefer to use these melee weapons as they are perfected for sneak attacks. When a Silent Wraith spots an enemy, they turn near-transparent and silently float over to them and attempt to stab the enemy with their knife.