Assamites may spit his or her vitae at foes, inflicting aggravated wounds to those hit. This form of attack is almost silent but the damage it causes leaves horrible, permanent scars on mortals and vampires alike.

System: The maximum range of this attack is 10 feet for each point of Strength or Potence (whichever is higher) the attacker possesses. The roll to hit a target is Stamina + Athletics (difficulty calculated as per firearm rules). The attacker may expend as much vitae on a shot as her generation’s Blood Points per Turn rating allows. However, all the vitae must be expended and spewed forth in one turn; otherwise, the caustic blood burns the Assamite’s mouth. 

[ This clarification from Rob Hatch, Vampire Developer, back in the day ]