Light Devourer

Shield, rare, requires attunement   While attuned to this shield you gain a +1 bonus to your Constitution saving throws.    The shield has 3 charges that it regains daily at dusk. If you have the shield equipped and are attuned to it, as an action, you can expend 1 charge to cause the shield to absorb all light around you for 1 minute. The area in a 20 foot radius centered on you becomes covered in darkness. This darkness cannot be dispelled by magical light, as it simply absorbs it.   You can see through the darkness that it creates. While the shield is absorbing light in this manner your movement speed becomes 0.