Candle of Anti-light (Patreon)

Wondrous item, uncommon

While burning, this dark candle sheds magical darkness in a 10-foot radius. It can be lit for up to 1 hour before it’s consumed and can be snuffed or relit like a normal candle as a bonus action. Completely covering the candle with something opaque contains the darkness. A creature with darkvision can’t see through this darkness, and nonmagical light can’t illuminate it. 

"Without light, there can be no shadow."