Nightmare Lash-1/2

While holding this weapon, you gain a +2 bonus
to attack and damage rolls made with this magic
weapon. When you hit with a melee attack using
this weapon, it deals an extra 1d6+1 fire damage
for each charge.
When you reduce a hostile creature to 0 hit
points with this weapon, this weapon gains 1
charge. You don't gain this benefit for killing constructs or undead. This weapon loses 1d4
charges daily at midnight.