Lightning Strike

You add +1 bonus to attack and damage rolls made with this weapon. This magic Greatsword has Finesse property

Elecrified Blade

Every attack that hit deals bonus 2d6 lightning damage and marks the target for 3 minutes. You can use your bonus action to deal 2d6 lightning damage to all marked creatures in 30 ft radius and gain one charge for each marked creature.

Discharge

Sword can hold up to 8 charges you can use a bonus action to make your attack deal 1d6 bonus damage for each charge, if you use at least 5 charges you are also under effects of Haste spell for 1 minute. If the blade takes more than 8 charges it hits the wearer for 1d6 lightning damage for each overcharge and loses all charges.