Tornado Flamer ( active - auto cast): The Firebat gains the ability to throw flames at a little bigger range, but with wider area, the flames will go out spinning and thus slowing, doing more damage, also adding an cool graphic effect.
Inferno burst ( active): the fire bat charges his attack closing the flame bocals but increasing the fuel output, then unleashing on a short-medium range line gigantic flame that sets even the ground on fire.
Critical mass ( passive) : the firebat at random will unleash longer fire bursts that will do more damage but also will overheat it's gear, generating heat waves around him damaging nearby enemy units.
cocktail of flames( active): the firebat releases his fuel at target area, any unit that is affected will be embeded on this mix, and if touches fire will suffer an explosion and start to burn, lesser units will get out of control running with no logic around until someone or something put an end to the fire.
Hell walk ( active), the firebat throws some bombs around making an HUGE area be set on fire, any unit that steps the burning area will be damaged, except the firebat, that will suffer no damage AND will feed the flames around him make the area nearby himself have bigger flames and do more damage.
OBS: these 3 last abilities can and should be stacked giving even more damage bonuses resulting on even bigger destruction.