Stormneedle

Weapon (rapier), Rare

You gain a +1 to attack and damage rolls made with Stormneedle. In addition, when you hit with Stormneedle, you may use a bonus action to activate a shocking grasp spell which emanates from the blade.
On a hit, the target takes 1d8 lightning damage, and it can’t take reactions until the start of its next turn.
The spell’s damage increases by 1d8 when you reach 5th level (2d8), 11th level (3d8), and 17th level (4d8).