Rare Weapon (Longbow), Requires Attunement by a spellcaster

• Deals extra 1d6 radiant damage while you are standing in direct starlight
• Gives of dim light in a 5-foot radius. 

Piercing Starlight. While standing in direct starlight, when you hit a creature with an attack roll made with this magical weapon a 5 feet wide and 20 feet long line forms from the target, following the trajectory of the attack. Each creature in the area must make a DC 14 Dexterity saving throw, taking 1d6 radiant damage on a failure.

Blind Hunter’s Gaze. You can use this bow to cast Hunter’s Mark two times per long rest.
When you hit a creature with an attack, you can cast Hunter’s Mark at the target as a reaction, and without requiring you to see the creature. 
You gain 60 feet of Blindsight that can only perceive creatures targeted by your Hunter’s Mark.