Anomaly! Although this boss attacks with a bow,his attack animation looks like he would be using an axe.
He's unable to resurrect his pet, and has no skills except pet buffs, so first kill his pet and then he will be mostly harmless.
If you stick to the South-Eastern face of the rock that you emerge from (portal to the Command Post) you can plan your battles and sneak by the Kournans if you can avoid the aggro. From there it's just a matter of 3 small groups of Heket before the boss group.