The individual beings of the race that came between the creation of the world, and the creation of the mortal races.

T'would take 30 hounds and a brace of knights to hunt a questing beast...

Behold, the Eldest.

Undead are, simply put, among the most horrific things one can think of. Can you imagine anything more frightening than a being which is dead and yet still walks? Can you imagine the horror of being faced by the hollow shell of being, a hollow shell which must feed?

Awakened by a Curse, fed by the cries and anger of children, this creature now roams the world.

The Challenge:
Think of any bizzare life-form, WHATEVER life-form that lives a not-so-standard way. Not the way common sense would expect it. Make it in some way logical or not, just forget the boring everyday logic.