This guy is not that hard (even though he spawns one add) If you have a puller such as monk, bard, etc. You can split them easily, but the named has a lot of HP and max hit on 95 paladin with 70k HP 8k AC was around 12-14k. And if you want the stole, this guy drops it mostly everytime you kill him. My group and I have got it 5 times in a row now.
Yes, he summons an Orator`s army lieutenant to assist him during the fight. However, it doesn't really matter since the add will pop in his room and stay there, and we won't fight him in the room.
To compare with Tactician Perak who summons 3 soldiers, this one is much easier.
This mob spawns in the building where Governor Parrin Wenst resides. Like most of the named in this room his ph is a single mob standing behind a table. Captain Dahlena spawns in the SE room. He single-target rampages and has some sort of silence spell that lasts a tick at most. In addition to the drops listed, he also drops Dahlena's Pommel Gem and a Median Alaran Cantrip.