Fetter

The Fetter was a result of a wizard not dying properly and reawakening as a creature without a physical body.

Anatomy
Fetters were tall creatures without a physical body, but rather an energy body. They had a body with a space-like appearance to it, they emmited a blue glow and their mouth and eyes were glowing blue. They had the ability of teleportation as they did not have physical body.

They fed on the lifeforce of living creatures, making them age very quickly before killing them. After absorbing enough lifeforce, a Fetter would have grown larger and stronger.

The Fetter would have grown taller, being significantly taller than a human being. They would grow while armor around them and their powers would be enhanced. They would grow light blue glowig energy hair, and their eyes would glow light blue instead of the faded blue.