Actions

Boiling Oil Slick

Eject a 1 Meter Wide column of Boiling Oilbackwards, 4 Meters.Being covered in this Oil deals a continuos 2d4 fire damage every action the creature takes for 3 turns. Standing in this oil deals 2d4+2 fire damage. Moving across this Oil deals 4 Fire Damage and requires a dex save of 12 or higher to not be knocked prone.

Fire-Ball Toss

Throw A ball of condensed Flaming Oil and Gas.
Range: 10 Meters. Explodes in an AOE sphere of 4d6+1 fire damage, that is 1.5 Meters in diameter.

Heat Flex

All creatures within 3 Meters of the Fireman take 3D8 Fire damage.

Ignition

As a last ditch effort the Fireman Ignites their Gas and Oil Tanks sending the Fire Engine into Overdrive.
They deal an additional 2 Die of damage for each attack and move at double their base walking speed.
Any creatures within 4 meters of this creature must make a Con save of 13 or higher, failing reduces their movement speed to half of their base movement speed.
After the creature has spent 2 of their turns Ignited, they will enter a Death Spiral. While in Death Spiral; This creature is unable to perform attacks. At the end of their third turn, this creature will detonate for 4d12+3 Fire damage in an 9ft radius, instantly dying.

Regional Effects

Firemen can soar to the roof's of nearby buildings, using them for High Ground, Mobility, Ambushes, Escapes and similar functions.

Usual Tactics

Firemen tend to run into close to mid-ranged combat and attempt to either beseige thier opponent with their flames or grapple them.
When sufficiently damaged or enough of it's allied forces have perished, they will either "Ignite" or Flee.