The wand has 4 charges. While holding it, you can use an action to expend 1 of it's charges to cast Spiritual Weapon You regain 1d4 charges after every long rest.

The bark shoots a sort of magik, electrical beam in your hand. The energy beam lasts for the duration or until you cast this spell again. When you cast the spell, you can make a melee spell attack against a creature within 5 feet of the weapon. On a hit, the target takes lightning damage equal to 1d8 + your spellcasting ability modifier.

As a bonus action on your turn, you can move the weapon up to 20 feet and repeat the attack against a creature within 5 feet of it.

The weapon takes the form of a glowing energy beam (lightsaber) 

Notes: As you spend time Attuning to this weapon. You feel the energy force and pull to really connect you to a crystal within the Bark. Giving you this Electrical Mystical sort of feeling.