The Krok-Rhek was a massive nuclear weapon built by the scientists of Carapar V of the Fourth Kingdom . It was deployed in 70,960 BBY on Geonosis , obliterating the Glomylin Hive and killing Tateyana the Bellicose.
The bomb worked by thermonuclear fusion of Hydrogen into Helium and then Helium into Carbon. It weighed about 100 tonnes (100,000 kg) and had a yield of 1 Gigatonne (1 Trillion Kg of TNT). It is unknown whether others of its kind were ever developed by the Barraki.