Amulet of the Moon Maiden's Mercy Bringer

This silver amulet features the symbol of Selune, bearing two large eyes carved of pure diamond and 7 stars made out of smaller diamonds set around it.

All weapon attacks made while wearing this amulet do an additional 1d12 poison damage on a hit. This poison damage ignores resistances and immunities.

The amulet has 9 charges and regains 1d6+2 expended charges after a Long Rest. While wearing this amulet, you can expend 1 or more of its charges to use one of the following properties:

Swiftness. Once per turn when you do damage with your Sneak Attack, you can immediately expend 1 charge to make one additional weapon attack at advantage. If you score a critical hit with this extra attack, you may apply your Sneak Attack damage again.

Alertness. When you roll for initiative, you can use your reaction to expend 1 charge to add your proficiency bonus to the roll.

Protection. When an allied creature that you can see within 30 feet of you takes damage, you can use your reaction to expend 2 charges to immediately make one weapon attack. On a successful hit, you may apply your Sneak Attack regardless of whether the proper conditions for it were met or not.

Vigilance. When one or more creatures that you can see within 30 feet of you are forced to make a saving throw, you can use your reaction to expend 2 or more charges. For 2 charges, you grant one affected creature of your choice advantage on the saving throw. For each additional charge you expend, you grant one more affected creature of your choice advantage on the saving throw. You make this choice after you see the roll, but before the GM says whether the roll succeeds or fails.

Divine Trait:

As an action, you can fire a magical arrow blessed by Selune to a point you can see within 120ft of you. Each creature of your choice within a 20ft radius of this point must immediately make a DC 18 WIS save, taking 6d6 radiant damage, or half on a successful save. Any creature that takes damage from this attack cannot regain Hit Points until the end of your next turn. you can use this feature 3 times per Long Rest.