The Croke developed on a planet known as Crakull in the Unknown Regions and colonized a larger area of the Unknown Regions known as the Croke Reach. They had a reputation in the galaxy for being unpleasant and vicious. At one point, the Croke fought a long and debilitating civil war. The destruction worsened greatly when one of the factions introduced a voracious species known as the Lugubraa—commonly employed as mercenaries in the Unknown Regions—as a weapon into the Reach's worlds. Many Croke-settled planets, such as Explume Minor, were destroyed by the Lugubraa, whose unfettered reproductive rate led them to feed voraciously. To wipe out the invasive species, the Croke purchased a genetically modified strain of Lugubraa, known as blind berserkers, from the cloners of Kamino. These clone