Kill the adds around the room and click the "a frightened spirit" to set them free. This will spawn Old Witherby.
First name: Old Witherby ( 221, -36, 852 ) Copy/waypoint 220.58, -36.15, 852.09
Tank and spank
Spawns several boars that run around and run around. As you fight him, a boar will join the fight for a moment, and then run off again.
After killing Old Witherby, if you have killed all the trash and set the spirits free, War Master Ryzon will spawn
Second name: War Master Ryzon ( 268, -28, 779 ) Copy/waypoint 267.64, -27.65, 778.51
Rocks fall round the area where you fight him. These do damage and have a knockback.
At 50%, he gets off his boar and you have to fight him and his boar, Diretusk. Diretusk is relatively weak, so burn him, then go back to War Master Ryzon.
Final name: Fire Monger Baltar ( 303, -36, 692 ) Copy/waypoint 302.65, -36.14, 691.69
At several times during the fight an emote will appear. "Some Combine soldiers that you previously rescued are trying to get your attention!" You need to hail one of these spirits to be able to damage Fire Monger Baltar.
You may need to pull him away from the fire that he's walking near.