Restless Door

The Restless Door was an artifact used to create portals through dimensions, similarly to the Key. It had the appearance of a box with purple crystals, with a key-like golden object inside it.

Biography
Used by Archaeus, the Restless Door released a Morituri demon from its dimension, to attack the Scooby Gang. They then tracked the artifact and found him in San Francisco's shipyard. Within multiple layers of magical protection, it broke Xander's favorite axe in an attempt to destroy it. Willow was able to reduce its protection into two layers, so Buffy attacked the Restless Door with her scythe, breaking it in three pieces.

The fragments, though, were stolen by the Mistress, Soul Glutton, and Sculptor, who reconstructed the artifact. They first released a demon that targeted Xander and Giles, until Willow killed him.

Appearances

 * Old Demons, Part One
 * Old Demons, Part Two
 * Old Demons, Part Three