I've spent HOURS tracking this guy and the other nameds on the East side of Field of Bone. There is a ton of variance, but Iksar Dakoit is the most reliable. His PHs can be wolves (stalker hunter), emerald fencer, marauder, and greater scalebones (probably others, but those are the ones I wrote down).
Most of the time he spawns just north of Kaesora, though I don't think there was a single spot, and then paths west down the ramp into the bone pit. This is probably the easiest PH to find because I don't think any non-PH roamers path down that ramp. Spawn time is just over 5 minutes like all rares in the zone compared to instant repop for non-PH.