Erastone

Erastone is a crown Teigu wielded by Honest. It is also called Anti-Teigu.

History
During the Revolutionary Army's rebellion, Honest used Erastone against Leone to destroy her Lionelle after she attempted to charge at him.

Abilities
In the manga, Erastone was shown to be a jewel within Honest's crown. When activated, the center opens, shining a light upon the opponent in range of it. Destroying both their Teigu and the crystal itself, after which shattering upon use, the crystal can regenerate over time giving it a weekly usage.

In the anime, Erastone was shaped as a golden ring of average radius. When activated, a purple eye opened in its center, with black branching patterns appearing around the eye itself. Once its user chose their target, the ring shined a bright light towards a designated Teigu, disabling and destroying the weapon and itself afterwards.

Manga & Anime Differences
Erastone
 * In the anime, the weapon had a singular usage, as the ring and all would shatter once its effect had been utilized.