The Venator-Class Star Destroyer, also known as Republic Attack Cruiser, was constructed by Kuat Drive Yards in the course of the Clone Wars. It was the first starship in the Grand Army of the Republic that was not designed as a cargo- or troop transporter but in fact as a ship-to-ship combat vessel. 

Its massive aggressive looking armoured hull can take extensive beatings, while its countless weapon emplacements are capable to punch through strong shields and thick armour without much effort.

The forward half of the cruiser is basically one huge launch bay carrying countless ships from starfighters to assault gunships, which can be released almost simultaneously with the opening of the two massive blast gates on the ship's upper hull.