Sneak Attack

You know how to strike subtly and exploit a foe's distraction. Once per turn, you can deal an extra
4d6 damage to one creature you hit with an
attack if you have advantage on the attack roll.
The attack must use a finesse or a ranged
weapon.
You don't need advantage on the attack roll if
another enemy of the target is within 5 feet of it,
that enemy isn't incapacitated, and you don't
have disadvantage on the attack roll.