Kukuwajack is a Named Enemy in DLC2 of Borderlands 3 that you need to defeat for the Occult Hunt. It is located in Negul Neshai on the Planet Xylourgos. You encounter it just before the boss fight with the Empowered Grawn.
You can farm Kukuwajack for the Anarchy as it is the dedicated loot source for this item. Kukuwajack’s legendary item has a 12.5% drop chance.