Nak'tra Crystal
this tough crystal was native to the deepest caverns found on the planet Kashyyyk. These crystals were harvested by the Wookiees of the Myyydril tribe, who found that they were an effective weapon against the Urnsor'is. Individual crystals were used as the focusing lense for specialized blaster weapons, which emitted coherent energy of a specific wavelength that did large amounts of damage to the Urnsor'is.