Rapid-recharge "Fleet Killer" Megalaser
The Silencer is a Imperial superweapon consisting of a Harrower-class Dreadnaught equipped with a rapidly recharging Megalaser. This laser was called a "fleet killer" because it had both the power and the speed of fire to destroy several capital ships in rapid succession. Because of this, it was considered a superweapon by the Sith Empire.
Using the Sun Razer, The Sith Empire was able to complete its creation in years instead of decades. All the projects fueled by the Sun Razer were overseen by Darth Mekhis and discovered by Theron Shan and Jedi Master Ngani Zho upon their infiltration and capture in the Vesla system.
By 10 ATC, during the Cold War, Darth Thanaton canceled the Silencer project, as he was a staunch believer of the superiority of the Force over any new technology. However, Moff Valion Pyron contacted his rival, Lord Kallig about the Silencer and stated that using it could win valuable allies within the Imperial military. The last piece required was a CN-12 schip being held by a group of cyborgs called the Veil on Nar Shaddaa.
After acquiring the CN-12, Pyron managed to finish the Silencer Megalaser and mounted it on the Imperial warship Doombringer. Kallig was then able to use the superweapon against a small Republic fleet, completely annihilating it. This had the effect of rallying Pyron and other Moffs to the Inquisitor's cause, which gave the rival Sith Lord the backing to seriously challenge Thanaton. Kallig also instructed Pyron to ensure that their allies got a Silencer for their own capital ships.
Like many capital ships throughout history, the Silencer had a triangular shape. It had a trough down the center of the ship to make way for the Megalaser burst. The trough had a residual electrical field visible down its length.