A thought bomb was the result of an ancient ritual that, through the focused willpower of many unified Sith Lords, unleashed the full volatility of the dark side of the Force. When detonated, a thought bomb physically decimated every Force-sensitive being caught within its blast radius and absorbed their fragmented souls into a swirling vortex of perpetual torment that resolved into an orb of silver iridescence. While the ability to wield such destructive power originated with the ancient Sith, its existence was discovered during the Jedi Civil War by the Dark Lord of the Sith Darth Revan, who recorded the secrets of its creation within his Sith holocron. Revan's repository and the thought bomb ritual therein remained hidden in a forgotten temple on the planet Lehon until it was discovered in 1,000 BBY by the Sith'ari, Darth Bane, who passed the instructions for its creation on to Lord Kaan, leader of the Brotherhood of Darkness. In a desperate attempt to end the war in which they were engaged with the Jedi, the Dark Lords of Kaan's Sith Brotherhood created and detonated a thought bomb that annihilated nearly all sapient Force-sensitive life on the planet Ruusan.