A spore bomb was a weapon created by Ho'Din terrorist Ort Hoogra-D'En. He used it to spread bioweapons he created from various plant spores. He set off 5 bombs, including one that killed 45 people at the Bombing of Syndaar Military Prep School.
It used tamack spores to spread a highly infectious disease. Infection happened almost immediately, and death usually occurred in a few hours. The disease was spread by contact or inhalation, and was treatable through total bacta immersion. It had a blast radius of 40 meters.