I think I have like 4 of him , one for each base to be honest. I get him at Sinner’s Refuge, might take a few tries but he will spawn there faster then anywhere else I have found. Besides a lot of other named crafters will spawn there so its a good spot to farm. I go in , if find a named take it if not I kill every thing , go out get some coal, kill some spiders up the hill a bit, kill a few hyena for their hides. Its like a afternoon out lol.
Come back and if those 3 are on door do again until I find what I want but you have to kill everyone in side I find, if you leave one alive its iffy if you get a better spawn. Also good for farming brimstone while you farm thralls. Besides like having those fancy dressed The Chosen of Asura at all my bases.
I have also gotten him in a purge - A band of starved exiles, think just last week.