You have a +2 bonus to attack and damage rolls made with this magic weapon. The first strike that hits each round deals the bonus necrotic and poison damage, otherwise it does standard damage. 

This magic blade is wreathed in shadow like flame. The completely black blade underneath gives off a menacing feeling. 

Whenever you strike an enemy with this blade a shadowy orb is cast to an unoccupied square within 5ft of the enemy (limit once per round). On the next turn, if you hit an enemy within 10 ft of the orb, you have the option to either explode an existing orb, or create a new one. If you choose to explode one orb, the orb bursts shooting shadow-like daggers towards the enemy and it does an additional 2d6 necrotic damage (Only one orb can explode at a time).

Summoning and maintaining an orb requires concentration, and therefore may be broken but it is not considered a spell. 

Cursed - Shadowblade seeks only the strongest suitors, and if it thinks you are unworthy of holding it... it will turn on you. Rolling a natural 1 to hit will result in the blade turning on you and striking you as if you were the enemy. 

Proficiency with a Shortsword allows you to add your proficiency bonus to the attack roll for any attack you make with it.

Notes: Bonus: Magic, Damage: Necrotic, Damage: Poison, Requires Attunement, Damage, Combat, Finesse, Light, Vex