The Karrastra Destructor is the Vasari's Siege Frigate. Official Description: While of only minimal use in ship-to-ship combat, the Karrastra's true purpose lies in planetary bombardment which it accomplishes with ease. Not many Karrastra's were present in the original Exodus Fleet and almost none were constructed until over a year into the war with the Traders. Previous engagements at scheduled resource acquisition drops required next to no siege capabilities and no future need was anticipated. Production rates have increased dramatically since.