Malevolence

 

The Malevolence was the biggest ship in the CIS nav. Built by separatist quarren, she became general Grievous flagship, destroying numerous republic fleets and even attacking defenceless medical convoys. Her despicabl reign of terror would end in a daring campaign led by jedi knights Kenobi and Skywalker. First Anakin and his padawan, Ahsoka, destroyed the massive Ion Cannon in a bombing run.  Afterwards, with the crippled ship fleeing from a new republic fleet, the jedi would board her and reprogram the hyperspace computer to direct her into a nearby moon. While Kenobi and Grievous duelled on the internal shuttle train system, the droids managed to repair the hyperdrive, unwittingly crashing the massive dreadnought into the moon. Grievous escaped as always, and Anakin rescued Padme (who was held hostage in the ship thanks to a Palpatine plot to protect the ship).

Despite her massive size of 4.8 km the Malevolence was faster than venator cruisers, her hyperdirve however was somewhat slower

The main armament of the ship was a pair of Heavy Ion Cannons that could disable entire fleets with one shot, however they proved vulnerable to torpedo attacks

The shark-like prow mounted dozens of turbolaser batteries and proton torpedo launchers

The ship showed up on the first season of the Clone Wars series, episodes 2-4

According to the wookiepedia four more vessels of the same class were built, one with a frontal supergun instead of the ion cannons