Awakened guardian: Ghost

A beautiful, curved bow with decorative curves all over the limbs, emanating blue faerie energy. The bow was in fact created with the intention of laying the unwilling spirits of the material plane to rest.

You have a +2 bonus to attack and damage rolls made with this magic weapon.

 Ghost was designed to free restless spirit. The bow deals 2d6 extra force damage to any Undead creature. 

Every time you lay a spirit to rest, by getting the last hit on an undead, you gain a charge of spirit. Stronger spirits give more charges, based on their cr. The minimum charge given by an undead is 1. The maximum amount of charges you can have at any time is 20. These charges can be expent in different ways. 

1 charge: you request a spirit you've freed in your next attack. The arrow is empowered by the spirit's blessing, granting you an extra 2d10 force damage on the next attack. 

5 charges: You may ask the spirits a single question regarding a creature you know the name of. They will know it, but might be vague when answering. The targeted creature may make a DC 16 wisdom saving throw to resists the effect. If successful, the spirits will return unsuccessfully. The charges will still be expent. 

10 charges: As an action, you release an arrow in a 10 ft. Wide, 120 ft. Long line. Blue spirits swirl around in a massive cylinder of energy. Anyone inside the cylinder must make a dexterity saving throw. On a fail, they take 6d10+wis mod. Force damage. On a succes, they take half. Undead killed in this way don't grant you any charges back. 

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

Notes: Damage: Piercing, Creature of good alignment. A dexterity or/and wisdom of 18 is a requirement. , Ammunition, Heavy, Range, Two-Handed, Slow