Wraith

A Wraith appeared in episode Sam, Interrupted. Wraith are relatively easy creatures to kill mainly because of there extreme weakness to silver. However when a wraith touches his victim, he or she becomes infected with a kind of venom that makes him or her slowly insane. The victim starts seeing things and has outbursts related to inner problems. Whenever the wraith is killed the venom has no longer effect.

A wraith feeds on brainfluids witch it can extract through a spike which is located in its wirsts. It can use it as a weapon but it breaks rather easly so it would be kind of stupid.

The wraith is a humanoid creature with a rotten face. Because a wraith can blend in by looking like a normal person, the only way to spot a wraith is to put it in front of a mirror so its real face can be seen.

The best survival place for a wraith would be a insane asylum. The brains are more "delicious and sooked in dopamine". Because no one believes a crazy person, the wraith can kill and suck everyone dry without being discovered when someone tells they have seen a monster.