Aura of Murder. As long as the night blade is not incapacitated, hostile creatures within 5 feet of it gain vulnerability to piercing damage unless they have resistance or immunity to such damage.
Dagger. Melee or Ranged Weapon Attack: +4 to hit, reach 5 ft. or range 20/60 ft., one target. Hit:4 (1d4 + 2) piercing damage.
Bhaal's cultists emulate their deity, carrying out gruesome murders to spread fear and horror. They are charming and disarming when they wish, but in combat their true, bloodthirsty nature comes to the fore.