|Race||Unknown (Fire Mobs)|
Grim Persecutors are the "big brothers" to Terror Maulers. They spit 3 consecutive fire balls. The relation of damage between fire and force is (at patch #183) 1:1.5.
Where to Hunt?
Canyon area. You can see that the area is around the volcano in the world map. These areas house a lot of Fire Mobs and are very suitable for ground-vehicle usage as well. The use of gunned vehicles is highly recommended, and the monsters do not require to be hacked for loot.
Fire resist helps here a lot. Various items and buffs can boost your Fire Resist. For example, Inquisition Armors 1-4, Heat Resist Boosters 1-3 and Holy, Resist Potion: Fire and Red Dragon drug, Blessed and normal Shelter. Having roughly over 100 Fire Resist/Armor in total makes the battles noticeably easier.