Was after him on and off for two weeks. Finally got him to spawn.
He popped near the zone over from The Void. I would pop my caster merc, put her on passive and run around the zone gathering up all the snakes, spiders, wolves, bears and bixies. Turn on Ae Burn after I gathered up a considerable amount and then wammo kill them.
When he spawned, I followed his pathing to see how he roamed.
Here are the points he stopped at and pathed between:
p900, p677, p12 just west of the zone over.
p733, p159, p61
p652, n77, p6
p802, n295, 0
The last three are more or less out in from of the zone over and in the open area/and the one rill in front of you. So not a big pathing area from what I saw at this point.
Good luck and happy hunting.