A Kiith Somtaaw Recon was searching the Karos Graveyard for a weapon that would help out with eliminating the Beast. It came upon a derelict with a massive cannon mounted on the front, and found it suitable. However, the recon detected hostiles inbound. The tactical officer on board the Kuun-Lan ordered it to return immediately.
The Somtaaw returned to it with Workers escorted by a hefty amount of Acolytes. Some of them broke off to engage incoming mines. The Turanic Raiders also showed some interest in the cannon and the Acolytes broke off to engage but as soon as the workers begin to latch on the cannon, some of the debris surrounding the derelict showed their true identity: Standard Corvettes came out of hiding and attacked the defenseless workers. Some of the acolytes came to their aid and tore apart the attackers. It was a long haul, but the workers make it back safely with the cannon.
After getting attacked by a sizable Taiidani fleet and after the Beast showed up, the Somtaaw tested the cannon on the Beast Mothership. Unfortunately, the shot had no effect on the monstrosity and a second shot would have done more damage, if the heating cylinders had not fused. So, they were forced to retreat from the advancing mothership.
After a fierce dogfight against the Bentusi, the Somtaaw convinced the Bentusi to help them. They replaced the heating cylinders with more heat-resistant tubes that can allow repeated firing. The Somtaaw tested the modified cannon on the Clee-San and it worked. The cannon was still in operation, and the Clee-San permanently disabled. They eventually lured the Beast Mothership into a trap, and the cannon tore it apart in one shot.
At Naval Base Alpha, the cannon was used again to throw a heavy blow against the Naggarok.
The siege shell it fires detonates in mid-space in an explosion that can vaporize any vessel smaller than a full mothership in a direct hit. Being caught in the blast can seriously damage any ship and will vaporize any ship smaller than a destroyer. The down side to the power of the Siege Cannon is the long recharge time between shots.
Because it is an area effect weapon, any and all ships in the area of the blast will receive damage, including friendly ships. Although it has a considerable range, the Siege Cannon's shot will degenerate quickly, drastically reducing its damage at higher ranges.