Talisman

"Appears under the moon, disappears under the sun."

- The text on the statue of the Tailsman.

Tailsman is a mysterious object appeared in Sonic X and its comic series published by the Archie Comics. It is an hourglass that keep the King Boom Boo and its Boo imprisoned on their dimension.

Appearance
It is a stone-like hourglass that had a figure of a sun on one end and a crescent with a star with the star being removed from the English dub.

Sonic X
The Tailsman was seen in the castle, discovered on the grounds of where a movie starring Lindsey Thorndyke was being shot. While animating the film, one of the film's photographer moved the Tailsman from its place, causing some Boos to release from their dimension, while Sonic was inside the castle feeling their presence. After some of interventions with the ghosts, his friends begin crying in the castle, while Sonic was noticing the fallen Tailsman in the garden, but quickly moved to them. When Sonic was taken by the Boos, he threw the hourglass to Chris hoping that they could use it to imprison the ghosts. In the morning, Chris and Amy noticed the presence of wind under the statue outside the castle, which the Tailsman was put on. Chris read the text atop it, and Amy knocked the statue, causing a secret passage underground to open. When they entered it, Amy and Chris found the Tailsman useful against the ghosts to avoid them. When they reached the central room where the portal exist, King Boom Boo manipulated Sonic's voice to trick them put the Tailsman's moon symbol above and the sun down, causing the King to break free from his imprison, alongside his ghosts and possessed Amy. Later, Chris then turned the hourglass upside, causing the sun symbol to light up and releasing Sonic. When all were rescued by Sonic, they escaped abroad the entrance, while the King Boom Boo and his ghosts were following them, but Amy knocked the statue again, causing it to close and Chris put the hourglass back to its original order, imprisoning them again.

Abilities
The Tailsman possess mystical powers that allows it to imprison the ghosts or open the portal of the ghosts' dimension, which are tied to the symbol the Tailsman is setting on. If the sun symbol is up it will weaken the ghosts and cause their imprisoned to release, while the moon symbol amplifies their power so they can teleport to the human's world. However, this work the opposite when the Tailsman is put on the statue outside the castle, as when the moon symbol is rising, they all return to their pocket dimension.