NPC: An Eldritch Vapor
Long Desc: A prismatic play of light and sound warps back and forth before you.

This being is strange, to say the least.  And rather hard to describe.
It has no seeming physical body, only light, and sound reflecting.  It is
hard to tell where this being is, or if it is moving, or if it has moved.
It could be best described as a prismatic play of light and sound, warping
back and forth in front of you.
It is a demon approximately 7'1" tall.

This NPC can be found in: The Proving Grounds.