Amulet of Darkness

While in complete darkness all of your attacks have advantage, additionally, you gain a +2 bonus to your Armor Class (AC).
This item also gives you advantage on DEX (Stealth) checks made while in complete darkness.
Conversely, while attuned all attacks made against you in light have advantage. 

Cursed: Once attuned to the Amulet of Darkness you cannot unattune to it without a remove curse spell being cast. Even if the user removes the item and disposes of the Amulet, they will remain attuned and will continue to incur the negative benefits of the Amulet of Darkness.

Notes: Bonus: Armor Class, Advantage: Stealth, Buff, Jewelry