#Dungeon23 Tomb of the Vampire Queen, Level 3, Room 4

Moving on down the hallway, you see a light in the cell to your left.

This cell seems empty but there is a light on the inside.  

The light is a wraith that has been trapped here since imprisoned by the Necromancers long ago. It was a human-bugbear hybrid but it was too stupid to be of use to the Necromancers, it was however violent and ill-tempered.  It died and now only its wraith remains. 

It is so consumed with anger that it will attack first before any thoughts of leaving its prison.

Its stats are the same as a wight, but it is ghost-like. It still drains like a wraith and needs magic to hit.