Rokur Gepta's biological weapon

The biological weapon owned by Rokur Gepta, the Sorcerer of Tund from Croke, could eliminate living things and tell illusions apart from actual entities. To force Lando Calrissian, the smuggler and gambler, to accept a duel within the ThonBoka nebula, Gepta threatened to deploy this weapon against the Oswaft, a spaceworthy species.