Forked Lightning

Weapon (longsword or whip), rare (requires attunement)

A fractured branching blade of fulgurite glass, held together with magical lightning. You gain a +2 bonus to attack and damage rolls to this weapon. 

Chain Lightning. As a bonus action, you can transform this weapon between longsword and whip form as the separate pieces are linked by electricity. 

Longsword: This weapon deals an additional 2d6 lightning damage on a hit. 

The DC of the Discharge property is increased by 2 (total of 17).

Whip: The reach of this weapon is 15 feet instead of the normal 10 feet.

Once per turn when you hit a creature with this weapon, you can move yourself to an unoccupied space within 5 feet of the target as long as it is not a smaller size than you. 

Discharge. As an action, you can unleash the energy held within this weapon to force each creature within range of this weapon to make a DC 15 Constitution saving throw. On a failed save, a creature takes 2d6 lightning damage and is paralyzed until the end of your next turn. On a successful save, it only takes half as much damage and suffers no additional effects. 

Once you use this property it can't be used again until you finish a short or long rest. 

Forged from a mineral gifted by the Great Storm, the branching blade once symbolized the power and authority bestowed upon the land’s rightful ruler. One fateful day, the palace was besieged by a rival kingdom who challenged the monarch to a duel for control. A decisive blow fractured the crystalline blade and laid the ruler low. For centuries, its fragments laid dormant, but when a worthy hand grasped its hilt, the storm’s wrath brought its pieces together; a symbol to mark the chosen heir as a hero to claim the throne.

Swordtember Prompt Vote: Fragmented: Offensive, Control, Mobility.