Zadul can be found at this location:
/wp [Arkadia, 23445, 10147, 165, Zadul Waypoint]
Zadul drop purple paint quite frequently. Their hides are not worth much and they are a mid-tier mob. You will need something like an Ozpyn LR S1X1 to kill them. It handles them fairly efficiently. That particular gun is common, not expensive, and can be tiered inexpensively.