The shikkar was a dagger crafted out of glass using mystical Force techniques. Shikkars were created by the Lost Tribe of Sith on Kesh. They were one-use weapons. After a successful stab, the hilt broke off, and the glass shattered, causing 127 damage, even more than a fully loaded cannon. The very first shikkars, or glass swords, were used by The Avatar in Britannia during the uprising of the Shadowlords.
Other weapons "invented" by the Lost Tribe of Sith included The Black Sword, which housed the demon Arcadion; the Magebane sword; the Firedoom Staff; the Lightning Whip; and the Infinity Bow. Nerds.