Lightspear

Weapon magical, versatile, light. Legendary (this item requires attunement) [only creatures whose alignment is lawful-good can attune to this weapon. once such a creature is attuned to this weapon it will reveal itself to be a sentient item.   If tried to be attuned by a creature whose alignment is not Lawful-Good this weapon appears to be a magic longsword +1, without the light property (the creature is not attuned).]

While attuned to this sword you gain +3 to attack and damage rolls made with this weapon.   It is a sentient weapon with the following properties:   Cha: 16 (+3), Wis: 17 (+3), Int: 12 (+1)   The sword has darkvision to a range of 120 ft. and can communicate with its owner telepathically.   the weapon has a purpose and it is to protect the innocent.   this weapon shed bright light to a range of 30 ft. and dim light to an additional 30 ft. beyond that, creatures of evil alignment have disadvantage on saving throws and attack rolls while in the bright light area. in magical darkness the range is 10 ft.   This weapon is immune to effects that render magic (such as a beholder's anti magic cone).   While attuned to this weapon you can cast one of the following spells: Heal, Raise Dead, Greater Restoration, Remove Curse. Once you used this property to cast a spell you can not cast that spell again until the next dawn.   Also while attuned to this weapon you have immunity to necrotic damage.